Extreme Bolt-On Power: S&S Cycle 1250 Big Bore Kit for Harley Sportster (1986–2022)

The S&S Cycle 1250 Big Bore Kit is one of the most popular and effective performance upgrades for the venerable Harley-Davidson Sportster platform, offering a significant displacement increase and a dramatic boost in torque and horsepower. This kit is a versatile power solution, designed to fit nearly three decades of Evolution Sportster models, covering the range from 1986 all the way through 2022 (excluding the newest Revolution Max-powered Sportster S/RH1250S and the XR1200 models).

This upgrade is specifically designed to convert stock 1200cc Sportster engines up to 1250cc, or to be used as a final stage in a complete 883cc to 1250cc conversion. It delivers the renowned quality of S&S Cycle engineering in a package that riders can install without complex engine disassembly.
Key Engineering and “Bolt-On” Advantage

The central appeal of the S&S 1250 kit is its ability to offer high-level performance while maintaining a relatively straightforward installation process.
True Bolt-On Installation

Crucially, the S&S 1250 kit is engineered to be a true bolt-on upgrade for 1200cc models. This means no machining or rebalancing of the stock crankcases or flywheels is required. The new 3-9/16″ bore cylinders are designed to perfectly fit the stock case openings, allowing the entire job to be performed with the engine still in the frame, saving considerable time and labor costs. This “weekend wrenching” accessibility is a major selling point for the Sportster community.

Forged Pistons and Cylinders

The kit comes complete with two new cylinders and matched forged pistons. Forged pistons are vastly superior to cast stock units, offering greater strength and durability to handle the higher cylinder pressures and heat generated by the increased compression ratios.

The kit is available in two main compression ratios to suit different performance goals and fuel requirements:

10.3:1 Compression Ratio: A reliable, high-performance option that is typically manageable with pump gas and an appropriate tune.

11.2:1 Compression Ratio: A higher-performance option that delivers maximum power but may require higher octane fuel or more aggressive tuning to prevent detonation.

The pistons also feature coated skirts for reduced friction and longer life, and larger than stock valve pockets to accommodate up to 2.00″ valves, should the rider decide on CNC ported heads as a future upgrade. The cylinders are supplied in a finish that matches the stock Harley aesthetic, such as Wrinkle Black or Silver powder coat.
Performance and Conversion Details

The results of the Sportster 1200 to 1250 conversion are immediately noticeable, providing a substantial increase in acceleration and usable street power.
Performance Gains

While the displacement increase from 1200cc to 1250cc may sound small, the combination of the larger bore, high-flow piston design, and increased compression ratio translates into a significant boost in performance, particularly when paired with the proper supporting modifications (high-flow air cleaner, performance exhaust, and a proper tune). Riders can expect dramatic improvements in mid-range and top-end horsepower and torque, often pushing power figures well beyond the stock factory limits.
883cc Conversion Requirement

For owners of 883cc Sportster models (which have smaller combustion chambers in their cylinder heads), this kit can be used to perform a radical 883 to 1250cc conversion. However, S&S specifies that 883 cylinder heads cannot be used with this 1250cc kit to achieve the correct compression ratios. XL1200 cylinder heads (or an aftermarket equivalent) are required to complete the conversion correctly, due to the different valve and combustion chamber design of the 883 heads.

Required Supporting Modifications

Achieving reliable peak performance from the S&S 1250 Big Bore Kit requires addressing the engine’s supporting systems:

Fuel and Ignition Management: This is non-negotiable. The increased air demands a corresponding increase in fuel. Carbureted models (pre-2007) will require new jets and possibly an ignition module. EFI models (2007-later) will require a flash tuner and a professional dyno tune to adjust the fuel maps and ignition timing.

Air and Exhaust: A high-flow air cleaner and a performance exhaust system are essential to allow the engine to breathe efficiently and extract maximum power.

Camshafts (Recommended): For ultimate power, especially when converting an 883, the addition of performance S&S cams (like the S&S 482 or 500 series) is highly recommended to take full advantage of the increased displacement and compression.

The S&S Cycle 1250 Big Bore Kit remains one of the most impactful and widely trusted ways to inject serious, track-ready power into the iconic Harley Sportster XL engine.

This Product Fits

Harley Davidson
Sportster Custom XL1200C 1996-2019
Sportster Custom XL883C 1998-2009
Sportster Deluxe XLH883DLX 1989, 1990, 1991, 1992
Sportster Forty-Eight Special XL1200XS 2018, 2019
Sportster Forty-Eight XL1200X 2010-2022
Sportster Hugger XLH883HUG 1988-2003
Sportster Iron XL1200NS 2018, 2019, 2020, 2021
Sportster Iron XL883N 2009-2022
Sportster Low/SuperLow XL883L 2005-2019
Sportster Low XL1200L 2006-2011
Sportster Nightster XL1200N 2007-2012
Sportster Roadster XL1200CX 2016, 2017, 2018, 2019, 2020
Sportster Roadster XL1200R 2004, 2005, 2006, 2007, 2008
Sportster Roadster XL883R 2002-2012
Sportster Seventy-Two XL1200V 2012, 2013, 2014, 2015, 2016
Sportster Sport XL1200S 1996-2003
Sportster SuperLow XL1200T 2014, 2015, 2016, 2017
Sportster XL883 2004-2009
Sportster XLH1100 1986, 1987
Sportster XLH1200 1988-2003
Sportster XLH883 1986-2003

Arlen Ness Velocity 65 Air Cleaner Kit: Sportster Performance Intake

The Arlen Ness Velocity 65 Air Cleaner Kit is a top-tier Stage 1 performance upgrade for 1988-2022 Harley-Davidson Sportster XL models (including 883 and 1200 Evolution engines). This aggressively styled high-flow intake is engineered to deliver some of the highest airflow numbers tested by Arlen Ness, significantly boosting horsepower and torque.

Features:

Aggressive 65° Design: Features a forward-facing, inverted 65-degree filter that acts like a velocity stack, pulling in massive amounts of air from all sides and the front for unobstructed airflow.

Sportster Power: Specifically tuned to maximize the performance potential of the Harley Evolution engine for instant throttle response and superior acceleration.

Patented Hidden Breather: Incorporates the exclusive Big Sucker “hidden breather” technology, routing the engine’s oil vent through the backing plate and into the mouth of the carburetor/injector for a clean custom look without external hoses.

Reusable Filter: Includes a water-resistant, synthetic filter element that requires no oil, is reusable and easily cleaned, offering long-term value and eliminating the need for a rain sock in most conditions.

This Velocity 65 kit is a must-have bolt-on modification for the Sportster owner seeking maximum performance and a distinct, racing-inspired aesthetic. Arlen Ness Velocity 65 Air Cleaner Kit For Harley Sportster
The Arlen Ness Velocity 65 Air Cleaner takes inspiration from the 90 degree Monster sucker with even more airflow and power! The unique 65 degree angle gets the air filter way out there in the clean air, allowing it to suck up more air then imagined! The forward facing design makes banging your knee into the air cleaner is a thing of the past.
Key Features:

Features patented Big Sucker “hidden breather” technology and a forward facing 65° intake design that produces the highest air flow performance numbers (CFM) we have tested
Ness hidden breathers are o-ringed at the heads and exit out the mouth of the injector/carb to provide efficient engine breathing, eliminating the need for any external hoses or hardware
Integrated radius air inlet for performance gaining unobstructed airflow
Inverted 65° style filter features a built-in inverted top to pull in air not only from all sides of the filter but also the front, which directs more performance gaining airflow into your engine
Each filter is constructed from synthetic material that is water resistant, which in most cases eliminates the need for a rain sock
Filters are re-usable and do not require oil, just rinse and re-use.

This Product Fits

Harley Davidson
Sportster Custom XL1200C 1996-2019
Sportster Custom XL883C 1998-2009
Sportster Deluxe XLH883DLX 1989, 1990, 1991, 1992
Sportster Forty-Eight Special XL1200XS 2018, 2019
Sportster Forty-Eight XL1200X 2010-2022
Sportster Hugger XLH883HUG 1988-2003
Sportster Iron XL1200NS 2018, 2019, 2020, 2021
Sportster Iron XL883N 2009-2022
Sportster Low/SuperLow XL883L 2005-2019
Sportster Low XL1200L 2006-2011
Sportster Nightster XL1200N 2007-2012
Sportster Roadster XL1200CX 2016, 2017, 2018, 2019, 2020
Sportster Roadster XL1200R 2004, 2005, 2006, 2007, 2008
Sportster Roadster XL883R 2002-2012
Sportster Seventy-Two XL1200V 2012, 2013, 2014, 2015, 2016
Sportster Sport XL1200S 1996-2003
Sportster SuperLow XL1200T 2014, 2015, 2016, 2017
Sportster XL883 2004-2009
Sportster XLH1200 1988-2003
Sportster XLH883 1988-2003

Next Generation Brightness: HogWorkz LED 5 3/4″ V2 Headlight for Harley (1988–2026)

The HogWorkz LED 5 3/4″ V2 Headlight represents the latest evolution in high-performance, Harley Daymaker-style LED lighting. Designed as a superior, direct-fit replacement for the smaller 5.75-inch headlight housing, this V2 version delivers enhanced brightness, improved light pattern, and reliable functionality for a massive range of Harley-Davidson Sportster, Dyna, and Softail models spanning 1988 through the current model year (2026).
Next Generation Brightness: HogWorkz LED 5 3/4″ V2 Headlight for Harley (1988–2026)

The HogWorkz LED 5 3/4″ V2 Headlight represents the latest evolution in high-performance, Harley Daymaker-style LED lighting. Designed as a superior, direct-fit replacement for the smaller 5.75-inch headlight housing, this V2 version delivers enhanced brightness, improved light pattern, and reliable functionality for a massive range of Harley-Davidson Sportster, Dyna, and Softail models spanning 1988 through the current model year (2026).

V2 Performance: Brighter, Wider, Safer

The V2 iteration features significant upgrades in LED chip technology and lens optics, ensuring you get the most light on the road where it counts.

Massive Lumens Output: This headlight boasts impressive power, typically generating up to 4200 Lumens on High Beam and 3600 Lumens on Low Beam. This extreme brightness offers up to a 200% increase in road illumination compared to stock halogen, ensuring you never outride your light.

Focused 6500K Light: The light emitted is a pure 6500K super bright white LED light, providing superior color contrast and depth perception to minimize rider fatigue and maximize object recognition at night.

Widespread Coverage: Featuring six individual LED projector lenses, the V2 is engineered to create a new, widespread light left-to-right pattern. This improves peripheral vision, lighting up road shoulders and ditch lines far better than previous designs.

Engineering for Harley Reliability

HogWorkz specifically addresses common issues found with generic LED headlights, ensuring seamless performance with your Harley’s electronics.

Buzz-Free Anti-Interference Design: A critical feature for riders is the HogWorkz Anti-Interference Headlight design. The integrated electronics and passive (no hum) cooling prevent the LED unit from emitting radio frequency interference, ensuring your bike’s radio and electronic systems remain crystal clear.

Rugged Construction: Encased in a durable, sealed die-cast aluminum housing and protected by a shatterproof polycarbonate lens, the V2 is built to withstand the intense shock and vibration of Harley-Davidson motorcycles.

Plug-and-Play Installation: Engineered as a direct Plug and Play 5 3/4 LED Headlight replacement, it connects via the standard H4 connector common on most models. Its fitment covers popular bikes like the Sportster XL, Dyna (FXD), and various Softail models manufactured since 1988.

Choosing the HogWorkz 5 3/4 V2 LED Headlight is the definitive, high-quality choice for riders demanding the Best 5 3/4 Inch Headlight Upgrade for ultimate safety and a sharp, modern Blackout V2 Harley LED look.
HogWorkz LED 5 3/4″ V2 Headlight For Harley

The 5-3/4″ V2 LED Headlight from HogWorkz was designed to give you the light you need to see and be seen without breaking the bank. The V2 version provides 4200 lumens on high beam and 3400 on low beam. To top it all off HogWorkz uses use anti-interference electronics and passive cooling guaranteed not to affect the performance of your radio.

It has never been easier to add a bright white LED headlight to your bike. Everything is included for an easy installation so you can enjoy a brighter, clearer, safer ride with no electronic interference.
Features:

6500K Super Bright White LED Light increase vision by 200%
Six LED Projectors for increased brightness and exceptional visibility
New LED design creates widespread light left to right!
Projector lenses encased in an aluminum housing
Industry leading LED technology drastically reduces draw
Shock and vibration resistant LEDS, shatterproof polycarbonate lens
Superior visibility, safety, and durability
Simple installation, direct plug & play using our standard H4 connector
Headlight high beams are 4200 lumens, while the low beams are 3600 lumens

This Product Fits

Harley Davidson
Dyna Convertible FXDS 1994-2000
Dyna Glide Custom FXDC 1992
Dyna Glide Daytona FXDB-D 1992
Dyna Glide Sturgis FXDB-S 1991
Dyna Low Rider FXDL/I 1993-2017
Dyna Low Rider S FXDLS 2016, 2017
Dyna Street Bob FXDB/I 2006-2017
Dyna Super Glide Custom FXDC/I 2005-2014
Dyna Super Glide FXD/I 1995-2010
Dyna Super Glide Sport FXDX 1999-2005
Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003
Dyna Wide Glide FXDWG/I 2006-2017
Night Rod Special VRSCDX 2007-2017
Night Rod VRSCD 2006, 2007, 2008
Softail Bad Boy Springer FXSTSB 1995, 1996, 1997
Softail Blackline FXS 2011, 2012, 2013
Softail Breakout CVO/SE FXSBSE 2013, 2014
Softail Breakout FXSB 2013, 2014, 2015, 2016, 2017
Softail Convertible CVO/SE FLSTSE 2010
Softail Convertible CVO/SE FLSTSE2 2011
Softail Convertible CVO/SE FLSTSE3 2012
Softail Cross Bones Springer FLSTSB 2008, 2009, 2010, 2011
Softail Custom FXSTC/I 2007, 2008, 2009, 2010
Softail Deuce FXSTD/I 2000-2007
Softail Heritage Springer FLSTS/I 1997, 1998, 1999
Softail Night Train FXSTB/I 2000-2009
Softail Rocker C FXCWC 2007, 2008, 2009, 2010, 2011
Softail Rocker FXCW 2008, 2009, 2010, 2011
Softail Springer Classic FLSTSC/I 2005, 2006
Softail Springer FXSTS/I 1988-1999
Softail Standard FXST/I 2000-2012
Sportster Custom XL1200C 2004-2019
Sportster Custom XL883C 2004-2009
Sportster Forty-Eight Special XL1200XS 2018, 2019
Sportster Forty-Eight XL1200X 2010-2022
Sportster Iron XL1200NS 2018, 2019, 2020, 2021
Sportster Iron XL883N 2009-2022
Sportster Low/SuperLow XL883L 2005-2019
Sportster Low XL1200L 2006-2011
Sportster Nightster XL1200N 2007-2012
Sportster Roadster XL1200CX 2016, 2017, 2018, 2019, 2020
Sportster Roadster XL1200R 2004, 2005, 2006, 2007, 2008
Sportster Roadster XL883R 2004-2012
Sportster Seventy-Two XL1200V 2012, 2013, 2014, 2015, 2016
Sportster SuperLow XL1200T 2014, 2015, 2016, 2017
Sportster XL883 2004-2009
Street 500 XG500 2015-2020
Street 750 XG750 2015-2020
Street Rod XG750A 2017, 2018, 2019, 2020
Tour Glide Ultra Classic FLTCU/I 1989-1996
XR1200/XR1200X 2008, 2009, 2010, 2011, 2012

Indian
Scout 2015-2024
Scout 100th Anniversary 2020
Scout 101 2025, 2026
Scout Classic 2025, 2026
Scout Sixty 2016-2024
Scout Sixty Classic 2025, 2026
Sport Scout 2025, 2026
Sport Scout Sixty 2025, 2026
Super Scout 2025, 2026

Aggressive Style: HogWorkz LED 5 3/4″ Halomaker Headlight for Harley (1988–2024)

The HogWorkz LED 5 3/4″ Halomaker Headlight is the definitive aesthetic and performance upgrade for a vast array of Harley-Davidson models utilizing the smaller 5.75-inch headlight housing. Designed for riders of Sportster, Dyna, and select Softail models spanning 1988 through 2024, this headlight transforms your bike’s front end with intense, modern LED output and a signature “Halomaker” accent ring.
Halomaker Design: Performance and Presence

The HogWorkz 5 3/4 Halomaker Headlight blends high-performance optics with unique, head-turning styling.

Signature Halomaker DRL: The eye-catching circular LED halo ring surrounds the main lamp, functioning as a high-visibility Daytime Running Light (DRL). This drastically increases your bike’s profile in traffic, enhancing safety while providing an aggressive, modern look.

Brilliant White Light Output: The main projector optics deliver a powerful, crisp 6500K super white LED light. This massive leap in intensity and color temperature over stock halogen bulbs ensures excellent illumination of the road surface and maximum object recognition at night.

Focused Beam: The precision lenses create a wide, sharp low beam cutoff and a powerful, long-distance high beam, providing effective illumination without causing excessive glare to oncoming drivers.

Simple, Reliable, and Versatile Fitment

HogWorkz ensures that this premium upgrade is accessible and reliable for the most popular Harley platforms.

Wide Range Compatibility: This unit is a true drop-in replacement for nearly all Harley Sportster XL, Dyna (FXD), and certain Softail models (such as the FXCW, FXS, FXSB) from 1988 up to 2024.

Plug and Play Installation: Engineered for simplicity, the Plug and Play Harley 5.75 LED design means minimal hassle. The headlight typically connects directly to the factory H4 connector (minor wiring or adapter may be required for some specific models).

Anti-Flicker Technology: The integrated electronics ensure stable light output, preventing the frustrating flicker sometimes experienced with cheaper LED units. The aluminum housing also serves as a robust heat sink and protection against road vibration.

Choosing the HogWorkz 5 3/4 Halomaker Headlight is the Best 5 3/4 Inch Headlight Upgrade for riders who want uncompromising nighttime visibility paired with a sleek, custom appearance.
HogWorkz LED 5 3/4″ Halomaker Headlight For Harley

Hogworkz was born out of passion for transforming motorcycles. With over 67 years of experience, they produce quality, reliable parts that provide a custom look. This 7″ Halomaker Plug-n-Play LED Headlight kit has a pure white, road tested, LED projection lamp. The white halo DRL provides increased visibility and safety, especially from the side. HogWorkz specifically designed their LED Headlights using anti-interference electronics to ensure that radio performance would not be affected.
Features:

6500K Super Bright White LED Light increase vision by 200%
Exclusive HogWorkz Halo DRL Technology
LED Projectors for increased brightness and exceptional visibility
Projector lenses encased in an aluminum housing
Industry leading LED technology drastically reduces draw
Shock and vibration resistant LEDS, shatterproof polycarbonate lens
Superior visibility, safety, and durability
Simple installation, direct plug & play using our standard H4 connector
The high beam of the headlight has 4000 lumens, while the low beam has 3400 lumens

This Product Fits

Harley Davidson
Dyna Convertible FXDS 1994-2000
Dyna Glide Custom FXDC 1992
Dyna Glide Daytona FXDB-D 1992
Dyna Glide Sturgis FXDB-S 1991
Dyna Low Rider FXDL/I 1993-2017
Dyna Low Rider S FXDLS 2016, 2017
Dyna Street Bob FXDB/I 2006-2017
Dyna Super Glide Custom FXDC/I 2005-2014
Dyna Super Glide FXD/I 1995-2010
Dyna Super Glide Sport FXDX 1999-2005
Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003
Dyna Wide Glide FXDWG/I 2006-2017
Night Rod Special VRSCDX 2007, 2008, 2009, 2010, 2011
Night Rod VRSCD 2006, 2007, 2008
Softail Bad Boy Springer FXSTSB 1995, 1996, 1997
Softail Blackline FXS 2011, 2012, 2013
Softail Breakout CVO/SE FXSBSE 2013, 2014
Softail Breakout FXSB 2013, 2014, 2015, 2016, 2017
Softail Convertible CVO/SE FLSTSE 2010
Softail Convertible CVO/SE FLSTSE2 2011
Softail Convertible CVO/SE FLSTSE3 2012
Softail Cross Bones Springer FLSTSB 2008, 2009, 2010, 2011
Softail Custom FXSTC/I 2007, 2008, 2009, 2010
Softail Deuce FXSTD/I 2000-2007
Softail Heritage Springer FLSTS/I 1997, 1998, 1999
Softail Night Train FXSTB/I 2000-2009
Softail Rocker C FXCWC 2007, 2008, 2009, 2010, 2011
Softail Rocker FXCW 2008, 2009, 2010, 2011
Softail Springer Classic FLSTSC/I 2005, 2006
Softail Springer FXSTS/I 1988-1999
Softail Standard FXST/I 2000-2012
Sportster Custom XL1200C 2004-2019
Sportster Custom XL883C 2004-2009
Sportster Forty-Eight Special XL1200XS 2018, 2019
Sportster Forty-Eight XL1200X 2010-2022
Sportster Iron XL1200NS 2018, 2019, 2020, 2021
Sportster Iron XL883N 2009-2022
Sportster Low/SuperLow XL883L 2005-2019
Sportster Low XL1200L 2006-2011
Sportster Nightster XL1200N 2007-2012
Sportster Roadster XL1200CX 2016, 2017, 2018, 2019, 2020
Sportster Roadster XL1200R 2004, 2005, 2006, 2007, 2008
Sportster Roadster XL883R 2004-2012
Sportster Seventy-Two XL1200V 2012, 2013, 2014, 2015, 2016
Sportster SuperLow XL1200T 2014, 2015, 2016, 2017
Sportster XL883 2004-2009
Street 500 XG500 2015-2020
Street 750 XG750 2015-2020
Street Rod XG750A 2017, 2018, 2019, 2020
Tour Glide Ultra Classic FLTCU/I 1989-1996
XR1200/XR1200X 2008, 2009, 2010, 2011, 2012

Indian
Scout 2015-2024
Scout 100th Anniversary 2020
Scout Sixty 2016-2024

The Torque Master: S&S Cycle 475 Cam Kit for Harley Milwaukee-Eight (2017–2026)

The S&S Cycle 475 Cam Kit is arguably the most popular and effective bolt-in performance camshaft upgrade available for the modern Harley-Davidson Milwaukee-Eight (M8) engine (2017–2026). Engineered specifically for riders who want massive, usable power where they need it most—on the street and highway—the 475 cam is designed to deliver a dramatic increase in low and mid-range torque, transforming the M8’s character into an effortless, responsive powerhouse.
Precision Engineering for Low-End Muscle

The stock Milwaukee-Eight engine provides a smooth, but often restrained, power delivery. The S&S 475 Cam corrects this by significantly optimizing the valve timing, lift, and duration to increase cylinder pressure across the lower RPMs.
The Sweet Spot: 2,000 to 5,000 RPM

The 475 grind is expertly optimized to maximize the powerband in the 2,000 to 5,000 RPM range. This is the range where a majority of street and touring riders operate their bikes, making the cam exceptionally effective for:

Aggressive Launching: Instant thrust off the line.

Effortless Passing: Rapid acceleration without the need for excessive downshifting.

Touring Comfort: Easily handling steep grades and fully loaded bags/passengers.

The result is a feeling of seamless, accessible power that is both exhilarating and practical for daily riding.
True Bolt-In Design

One of the greatest benefits of the S&S 475 Cam Kit is its design as a true bolt-in Milwaukee-Eight cam. Its lift profile is carefully chosen to be fully compatible with the stock valve springs and tappets in all 2017–2026 M8 models. This eliminates the need for expensive and labor-intensive head work (like swapping valve springs), making the installation quicker, easier, and much more cost-effective.
Comprehensive Kit Contents and Durability

The S&S 475 Cam Kit is typically offered as a comprehensive package to ensure not just performance, but also durability and reliability.
A Focus on the Cam Chest

To ensure reliable performance, S&S strongly recommends addressing the entire cam chest when performing a cam swap. Their kits often include or are designed to be paired with:

Premium Tappets/Lifters: High-quality, durable tappets are crucial for handling the increased lift and aggressive ramps of the new cam profile.

High-Performance Pushrods: Adjustable pushrods (often included) allow for precise setting of tappet preload, which is vital for engine longevity and eliminating noisy valve train operation.

Inner Cam Bearings: New inner cam bearings are a mandatory replacement during any cam swap to ensure smooth, friction-free operation.

The use of high-quality components solidifies the reputation of the S&S 475 Cam Kit as a foundational component for the most reliable 2017-2026 Harley Performance Cam builds.
Maximizing the Upgrade

While the cam itself is bolt-in, unlocking its full potential and ensuring safe operation requires key supporting modifications:

Fuel Management & Tuning (MANDATORY): A proper EFI tuner (like the S&S tunable unit) and a professional dyno tune are absolutely essential. The increased airflow and efficiency of the new cam profile change the engine’s fueling requirements. Running the engine without a tune will result in lean conditions, overheating, and potential engine damage.

High-Flow Air Cleaner & Exhaust: The M8’s improved breathing must be fed and expelled efficiently. A performance air cleaner and a free-flowing exhaust system are required to realize the maximum M8 475 Camshaft Upgrade gains.

The S&S Cycle 475 Cam Kit is the industry standard for riders of M8 Touring and Softail models who seek a reliable, easy-to-install upgrade that delivers a dramatic, adrenaline-boosting increase in usable torque.

S&S 475 Cam Kit For Harley Milwaukee Eight
Features:

100 Hp Bolt-in Cam (when coupled with intake and exhaust)
Eliminates cam drive chain and tensioner
Gear drive cams provide improved valve timing accuracy
Kits include all required bearings, o-rings, and hardware
Highly recommended to use S&S Cycle Quickee Pushrod Kit 1219815
Made in the USA

475 Cam Info:

Front Intake open/close 6.2°/27.2°
Front Exhaust open/close 55.2°/28.5°
Rear Intake open/close 2.2°/31.2°
Rear Exhaust open/close 52.2°/20.2°

Front Intake duration 213.5°
Rear Intake duration 213.5°
Front Exhaust duration 263.9°
Rear Exhaust duration 252.5°
Intake Lift .475″
Exhaust Lift .475″

Front Intake Lobe Center Line 100.5°
Front Exhaust Lobe Center Line 103.5°
Rear Intake Lobe Center Line 104.5°
Rear Exhaust Lobe Center Line 106.0°

Front Intake Lift at TDC .107″
Front Exhaust Lift at TDC .208″
Rear Intake Lift at TDC .093″
Rear Exhaust Lift at TDC .170″

Front Overlap 34.7°
Rear Overlap 22.4°

Made in the USA

This Product Fits

Harley Davidson
Electra Glide Standard FLHT 2019, 2020, 2021, 2022
Electra Glide Ultra Classic FLHTCU/I 2017, 2018, 2019
Electra Glide Ultra Limited CVO/SE FLHTKSE 2017, 2018, 2019, 2020, 2021
Electra Glide Ultra Limited FLHTK 2017-2024
Electra Glide Ultra Limited Low FLHTKL 2017, 2018, 2019
Freewheeler FLRT 2017-2025
Road Glide 3 FLTRT 2023, 2024, 2025
Road Glide CVO/SE FLTRXSE 2018, 2019, 2020, 2021, 2022
Road Glide CVO ST FLTRXSTSE 2024, 2025
Road Glide FLTRX 2017-2026
Road Glide Limited CVO FLTRKSE 2022, 2023
Road Glide Limited FLTRK 2020, 2021, 2022, 2023, 2024
Road Glide Special FLTRXS 2017-2023
Road Glide ST FLTRXST 2022, 2023
Road Glide Ultra FLTRU 2017, 2018, 2019
Road King FLHR/I 2017-2022
Road King Special FLHRXS 2017-2025
Softail Breakout 114 FXBRS 2018, 2019, 2020
Softail Breakout 117 FXBR 2023, 2024, 2025, 2026
Softail Breakout FXBR 2018, 2019
Softail Deluxe FLDE 2018, 2019, 2020
Softail Fat Bob 114 FXFBS 2018-2023
Softail Fat Bob FXFB 2018, 2019
Softail Fat Boy 114 FLFBS 2018-2024
Softail Fat Boy FLFB 2018, 2019, 2025, 2026
Softail FXDR 114 FXDRS 2019, 2020
Softail Heritage Classic 114 FLHCS 2018-2024
Softail Heritage Classic FLHC 2018-2026
Softail Low Rider FXLR 2018, 2019, 2020
Softail Low Rider S FXLRS 2020-2026
Softail Low Rider ST FXLRST 2022, 2023, 2024, 2025, 2026
Softail Slim FLSL 2018, 2019, 2020, 2021
Softail Sport Glide FLSB 2018, 2019, 2020, 2021
Softail Standard FXST 2020, 2021, 2022, 2023, 2024
Softail Street Bob 114 FXBBS 2021, 2022, 2023, 2024
Softail Street Bob FXBB 2018, 2019, 2020, 2025, 2026
Street Glide CVO/SE FLHXSE 2017-2022
Street Glide FLHX/I 2017-2026
Street Glide Special FLHXS 2017-2023
Street Glide ST FLHXST 2022, 2023
Street Glide Ultra FLHXU 2025
Tri Glide CVO/SE FLHTCUTGSE 2020, 2021, 2022
Tri Glide Ultra Classic FLHTCUTG 2017-2025

Precision Performance: S&S Cycle Camshaft Drive Gears for Harley Twin Cam (1999–2006)

The S&S Cycle Camshaft Drive Gear Kits are widely recognized as the single most critical durability and performance upgrade for the early Harley-Davidson Twin Cam 88 (1999–2006) engine platform. These kits are the definitive solution for eliminating the notorious factory flaw associated with the stock chain drive and spring-loaded cam chain tensioners. By converting the entire camshaft drive system to precision-machined gears, S&S provides an unparalleled foundation for reliability, consistency, and maximum power transfer.
Solving the Twin Cam’s Biggest Weakness

The early Harley Twin Cam 88 (1999–2006) engine utilized a chain-driven camshaft system where the chains were guided and tensioned by spring-loaded tensioner shoes made of a composite material. Over time and miles, these shoes are prone to wearing down and eventually failing. When they fail, the material contaminates the oil system, potentially leading to catastrophic engine damage.
The Gear Drive Solution

The S&S Cycle Camshaft Drive Gear Kit completely eliminates this weak link. By converting the system from chains and tensioners to a direct gear drive system, S&S provides several critical advantages:

Elimination of Failure Points: The notorious cam chain tensioners and their susceptibility to wear are gone, offering the ultimate in maintenance-free reliability.

Precise Cam Timing: Gears are inherently more rigid and precise than chains. The S&S gear drive system ensures that the cam timing is held rock-solid throughout the RPM range. This unwavering timing accuracy translates directly into consistent combustion events and maximum engine efficiency, which is especially critical for high-performance Upgrade Twin Cam 88 Cams.

Increased Horsepower: By eliminating the friction and drag created by the chain, tensioners, and guides, the S&S Gear Drive Cams free up several horsepower that would otherwise be lost to parasitic drag.
Precision Engineering and Installation Requirements

The S&S Camshaft Drive Gears 1999-2006 are built to demanding specifications to ensure proper fitment and extreme reliability.
Gear Design and Material

The gears are precision-machined from high-quality steel and heat-treated for superior strength and wear resistance. They utilize an exact tooth profile that ensures smooth, quiet engagement and reduced backlash, though a characteristic “whine” is often heard, which many riders consider a desirable hallmark of a high-performance engine.
Critical Crank Runout Check

A crucial factor when installing an S&S Gear Drive Kit is the condition of the stock crankshaft. The Twin Cam crank is pressed together, and extreme runout can cause gear noise and eventual wear. S&S requires checking the crank runout (TIR) before installation. The runout must be within a tolerance of 0.003″ or less. If the runout exceeds this limit, the crank must be replaced or trued, typically requiring the motor to be split. This critical step ensures that the Harley Twin Cam Gear Drive Kit runs quietly and reliably.Kit Contents and Upgrade Path

The S&S Cycle Camshaft Drive Gears are often sold as a comprehensive system. While specific kit contents vary, they generally include:

Precision Inner and Outer Camshaft Drive Gears.

Replacement Outer Crankshaft Gear.

Necessary Hardware and Instructions.

Often paired with high-performance S&S Cams (e.g., S&S 510G, 570G) that are specific to the gear-drive system.

The S&S Cam Chest Upgrade is highly recommended for any rider using a performance camshaft or performing any big bore upgrade on their early Twin Cam. It is the ultimate insurance policy and foundation for reliable high-output performance in the 1999–2006 Twin Cam platform.

This Product Fits

Harley Davidson
Dyna Convertible FXDS 1999, 2000
Dyna Low Rider FXDL/I 1999-2005
Dyna Super Glide Custom FXDC/I 2005
Dyna Super Glide FXD/I 1999-2005
Dyna Super Glide Sport FXDX 1999-2005
Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003
Dyna Wide Glide CVO/SE FXDWG2 2001
Dyna Wide Glide CVO/SE FXDWG3 2002
Dyna Wide Glide FXDWG/I 1999-2005
Electra Glide Classic FLHTC/I 1999-2006
Electra Glide CVO/SE FLHTCSE 2004
Electra Glide CVO/SE FLHTCSE2 2005
Electra Glide Standard FLHT/I 1999-2006
Electra Glide Ultra Classic FLHTCU/I 1999-2006
Road Glide CVO/SE FLTRSEI2 2001
Road Glide FLTR/I 1999-2006
Road Glide SE FLTRSEI 2000
Road King Classic FLHRC/I 1999-2006
Road King Custom FLHRS/I 2004, 2005, 2006
Road King CVO/SE FLHRSEI 2002
Road King CVO/SE FLHRSEI2 2003
Road King FLHR/I 1999-2006
Softail Deluxe FLSTN/I 2005, 2006
Softail Deuce CVO/SE FXSTDSE 2003
Softail Deuce CVO/SE FXSTDSE2 2004
Softail Deuce FXSTD/I 2000-2006
Softail Fat Boy CVO/SE FLSTFSE 2005
Softail Fat Boy CVO/SE FLSTFSE2 2006
Softail Fat Boy FLSTF/I 2000-2006
Softail Heritage Classic FLSTC/I 2000-2006
Softail Heritage FLST/I 2006
Softail Heritage Springer FLSTS/I 2000, 2001, 2002, 2003
Softail Night Train FXSTB/I 2000-2006
Softail Springer Classic FLSTSC/I 2005, 2006
Softail Springer FXSTS/I 2000-2006
Softail Standard FXST/I 2000-2006
Street Glide FLHX/I 2006
Ultra Classic Electra Glide CVO/SE FLHTCUSE 2006

Mid-Range Dominance: Feuling 525 Cam Kit for Harley Twin Cam (1999–2006 )

The Feuling 525 Cam Kit is one of the most popular and versatile performance upgrades for the entire range of Harley-Davidson Twin Cam engines. Designed by Feuling Parts, a company renowned for its precision valvetrain components, the 525 cam is engineered to deliver a massive increase in low and mid-range torque and horsepower, making it an ideal choice for the vast majority of street riders and touring enthusiasts.
Engineering for Usable Street Power

The Feuling 525 Cam is specifically ground to enhance the power delivery characteristics most valued by riders: instant throttle response and strong passing power. It is designed to work efficiently with the engine’s stock components, minimizing the cost and complexity of the upgrade.
The Versatile Bolt-In Advantage

The Feuling 525 Cam is celebrated for its bolt-in nature. The lift is engineered to be compatible with most stock or mild aftermarket cylinder heads and compression ratios (under 10.5:1). This means that for most Twin Cam engines, the 525 Cam does not require specialized valve spring replacement, simplifying installation and minimizing downtime and overall cost. It is an excellent bolt-in Twin Cam performance cam choice.
The Comprehensive Kit: Beyond the Camshaft

Feuling typically packages their cams in comprehensive kits designed for reliability and ease of installation, offering different options depending on the model year of your Twin Cam.

A Focus on the Cam Plate

Feuling is a leader in improving the critical cam plate area of the Twin Cam engine. Their kits often include, or are designed to be paired with, their precision-machined components:

Feuling High Volume Oil Pump: The kits are frequently paired with Feuling’s proprietary high volume and high pressure oil pumps. These pumps are crucial for enhancing engine longevity by providing superior oil scavenging (especially important for the Twin Cam’s breather system) and maintaining consistent oil pressure to the lifters and internal components, particularly in high-demand situations.

Feuling Billet Cam Plate: Upgrade kits often include Feuling’s billet aluminum cam plate, which is stronger, more rigid, and provides better oil passages than the stock cast unit, ensuring optimal alignment and performance for the new cams.

Chain Drive vs. Gear Drive

Feuling offers the 525 Cam in both chain drive (which uses the stock tensioner system) and gear drive configurations.

Gear Drive (Recommended for Pre-2007): The gear drive option eliminates the failure-prone stock chain tensioner shoes entirely, making it the most durable and maintenance-free choice for performance builds.

Chain Drive (For 2007-Later): The chain drive option is common for later models and is generally compatible with the factory hydraulic tensioners.
Target Audience and Performance

The Feuling 525 Cam Kit is the ideal solution for:

Touring Riders: It provides the grunt needed to move heavy bags and passengers easily.

Daily Commuters: The cam offers a smooth idle and excellent street manners without being overly aggressive.

Performance Enthusiasts: It delivers maximum power without requiring expensive head work or high-octane fuel.

Supporting Modifications

As with any cam upgrade, maximizing performance requires supporting systems:

Air/Exhaust: A high-flow air cleaner and a free-flowing performance exhaust system are mandatory to feed and scavenge the engine properly.

Tuning: A proper EFI tuner and a dyno tune are essential for adjusting the air/fuel mixture and ignition timing to match the new cam profile, ensuring reliability and peak power delivery.

The Feuling 525 Cam Kit stands out as the go-to Harley Twin Cam Mid-Range Cam for riders seeking a dramatic, reliable increase in usable street power for their 1999–2006 model.

This Product Fits

Harley Davidson
Dyna Convertible FXDS 1999, 2000
Dyna Low Rider FXDL/I 1999-2005
Dyna Super Glide Custom FXDC/I 2005
Dyna Super Glide FXD/I 1999-2005
Dyna Super Glide Sport FXDX 1999-2005
Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003
Dyna Wide Glide FXDWG/I 1999-2005
Electra Glide Classic FLHTC/I 1999-2006
Electra Glide Standard FLHT/I 1999-2006
Electra Glide Ultra Classic FLHTCU/I 1999-2006
Road Glide FLTR/I 1999-2006
Road King Classic FLHRC/I 1999-2006
Road King Custom FLHRS/I 2004, 2005, 2006
Road King FLHR/I 1999-2006
Softail Deluxe FLSTN/I 2005, 2006
Softail Deuce FXSTD/I 2000-2006
Softail Fat Boy FLSTF/I 2000-2006
Softail Heritage Classic FLSTC/I 2000-2006
Softail Heritage FLST/I 2006
Softail Heritage Springer FLSTS/I 2000, 2001, 2002, 2003
Softail Night Train FXSTB/I 2000-2006
Softail Springer Classic FLSTSC/I 2005, 2006
Softail Springer FXSTS/I 2000-2006
Softail Standard FXST/I 2000-2006
Street Glide FLHX/I 2006

Unleash the Evolution: Andrews EV27 Camshaft for Harley EVO Big Twin (1984–2000)

The Andrews EV27 Camshaft is arguably the most popular and celebrated performance upgrade for the Harley-Davidson Evolution (EVO) Big Twin engine platform, covering models from 1984 through 2000. Designed specifically to address the performance limitations of the stock Harley cam, the EV27 transforms the riding experience by delivering a massive, usable increase in torque and horsepower, making it the foundational choice for nearly every EVO owner seeking better street performance.
Engineering for Mid-Range Muscle

The stock cam in the 80 cubic inch (1340cc) EVO engine is notoriously mild, offering flat, uninspired power delivery. The Andrews EV27 Cam was engineered to correct this by shifting the powerband to where street riders need it most: the low-to-mid RPM range (approximately 2,000 to 5,000 RPM).
Ideal for Street Use

The profile of the EV27 is known for building cylinder pressure quickly. This results in an immediate, noticeable boost in low-end and mid-range torque, which is what you feel when rolling on the throttle to pass traffic or accelerating off a stoplight. This emphasis on usable street power is why the Andrews EV27 has earned its reputation as the Best Bolt-In EVO Cam for daily riding and touring.
The True Bolt-In Advantage

One of the biggest selling points of the Andrews EV27 Series Camshaft is its simplicity of installation for the Harley EVO Big Twin 1984-2000.

No Head Clearance Issues: The lift profile of the EV27 is compatible with the stock valves and rocker arms, meaning there is no need to machine or modify the stock cylinder heads for valve clearance. This keeps the installation cost and complexity low.

Retains Stock Valve Springs: In most healthy EVO motors, the EV27’s lift is low enough that it does not require high-performance valve springs (though checking spring height and pressure is always recommended during any cam swap).

This true bolt-in EVO cam capability makes it a favorite project for competent home mechanics and an affordable choice for shop installation, reducing the overall cost of the Evolution Engine Upgrade.
Required Supporting Modifications

To fully realize the power gains promised by the Andrews EV27, supporting modifications are essential:

High-Flow Air Cleaner: The cam’s increased breathing capacity requires a performance air intake to feed the engine more air.

Performance Exhaust: A less restrictive performance exhaust system (such as a 2-into-1 pipe) is necessary to efficiently expel the increased volume of exhaust gas.

Carburetor/Fuel Management Tuning: For carbureted models (most pre-2000), a jetting change is mandatory. The engine needs a richer air/fuel mixture to run cool and maximize power with the new cam timing.

Paired with these essential components, the Andrews EV27 Camshaft is the most effective and reliable way to maximize the performance of your Harley EVO Big Twin, providing reliable, exciting power throughout the riding RPM range.

This Product Fits

Harley Davidson
Disc Glide FXRDG 1984
Dyna Convertible FXDS 1994, 1995, 1996, 1997, 1998
Dyna Glide Custom FXDC 1992
Dyna Glide Daytona FXDB-D 1992
Dyna Glide Sturgis FXDB-S 1991
Dyna Low Rider FXDL/I 1993-1998
Dyna Super Glide FXD/I 1995, 1996, 1997, 1998
Dyna Wide Glide FXDWG/I 1993-1998
Electra Glide Classic FLHTC/I 1985-1998
Electra Glide Sport FLHS 1987-1993
Electra Glide Standard FLHT/I 1985-1998
Electra Glide Ultra Classic FLHTCU/I 1989-1998
Fat Bob FXEF 1985
FLH 1985
FXR2 CVO/SE 1999
FXR3 CVO/SE 1999
FXR4 CVO/SE 2000
Low Glide/Low Rider FXRS 1985-1993
Low Rider Chrome FXRC 1985, 1986, 1987, 1988
Low Rider Custom FXLR 1987-1994
Low Rider Sport FXRS-SP 1987-1993
Road Glide FLTR/I 1998
Road King Classic FLHRC/I 1998
Road King FLHR/I 1994, 1995, 1996, 1997, 1998
Softail Bad Boy Springer FXSTSB 1995, 1996, 1997
Softail Custom FXSTC/I 1986-1999
Softail Deuce FXSTD/I 1999
Softail Fat Boy FLSTF/I 1990-1999
Softail Heritage Classic FLSTC/I 1987-1999
Softail Heritage FLST/I 1986, 1987, 1988, 1989, 1990
Softail Heritage Springer FLSTS/I 1997, 1998, 1999
Softail Night Train FXSTB/I 1999
Softail Nostalgia FLSTN/I 1993
Softail Special FLSTN/I 1994, 1995, 1996
Softail Springer FXSTS/I 1988-1999
Softail Standard FXST/I 1984-1999
Sport Glide FXRT 1985-1992
Sport Glide Grand Touring FXRD 1986
Super Glide FXE 1985
Super Glide FXR 1986-1994
Tour Glide Classic FLTC/I 1985-1991
Tour Glide FLT 1985, 1986
Tour Glide Ultra Classic FLTCU/I 1989-1996
Wide Glide FXWG 1985, 1986