High-Performance Cometic Complete Primary Rebuild Kit for Harley-Davidson Sportster (2004–2022)

When it comes to maintaining a modern V-Twin, the quality of your seals can make the difference between a clean garage floor and a persistent oil leak. The Cometic Complete Primary Rebuild Kit for 2004–2022 Harley-Davidson Sportster models is designed for riders who demand the best in material science and durability. Since the introduction of the rubber-mounted engine in 2004, Sportsters have faced unique vibration harmonics that can cause standard paper gaskets to fail. Cometic solves this with advanced engineering and American-made quality.

The Cometic ACM Advantage: Superior Sealing Technology

The centerpiece of this Sportster primary gasket kit is the outer primary gasket, manufactured from Cometic’s proprietary ACM (Aluminum Core Material). This isn’t your standard fiber gasket; it features a solid aluminum core chemically bonded to a thin layer of nitrile rubber on both sides. This construction provides the structural rigidity of metal with the sealing flexibility of rubber. The aluminum core prevents the gasket from “walking” or extruding under high heat, while the nitrile coating ensures a perfect micro-seal against the engine case and primary cover.

Unlike original equipment gaskets, the ACM material is highly resistant to the chemical properties of modern synthetic primary fluids, ensuring the seal won’t swell, shrink, or become brittle over thousands of miles of heavy use.

Everything Included for a Professional Service

This is a comprehensive C9259 series (or equivalent) rebuild kit, specifically curated to provide every seal needed for a complete primary overhaul. Whether you are replacing a stator, servicing your clutch, or upgrading your compensator, this kit eliminates the need to source individual parts. The kit includes:

• Outer Primary Gasket: Premium ACM construction (replaces OEM 34955-04) for a leak-proof fit.
• Derby Cover Quad Seal: Specifically molded to prevent leaks at the clutch inspection port.
• Inspection Cover Gasket: High-performance seal for the primary chain adjustment window.
• Shifter Shaft Seal: Heavy-duty rubber designed to stop oil weeping at the selector shaft.
• Drain Plug O-Ring: A fresh viton/nitrile seal to ensure every oil change is drip-free.
• Internal Seals & O-Rings: All necessary hardware seals to finish the job to professional standards.

Wide Compatibility & Model Fitment

This kit is precisely engineered for the Evolution Sportster 5-speed drivetrain found in the modern XL era. It is a direct fit for:

• Iron 883 & 1200: XL883N and XL1200NS.
• Forty-Eight & Seventy-Two: XL1200X and XL1200V.
• Nightster & Roadster: XL1200N and XL1200CX.
• SuperLow & Custom: XL883L and XL1200C.
• Fits all XL models: Produced between 2004 and 2022.

Why Choose Cometic Gaskets?

Proudly Made in the USA, Cometic Gaskets are the choice of top-tier engine builders and professional race teams. Their Harley-Davidson primary seals are developed to withstand extreme heat cycles without losing torque retention. By choosing Cometic, you are investing in a product that provides a “one-and-done” installation. The rigid aluminum core makes the gasket remarkably easy to align, significantly reducing the risk of pinching or misalignment during the assembly process.

Installation Pro-Tips for Success

For the ultimate leak-free result, ensure that both the primary cover and engine case mating surfaces are meticulously cleaned and degreased. This Cometic Primary Kit is designed for dry installation. No RTV or liquid gasket tack is required, as the ACM material is engineered to seal perfectly on its own. Always follow the factory torque sequence to ensure even compression across the entire primary face.

Eliminate the drips and protect your Sportster’s drivetrain. Order the Cometic Complete Primary Rebuild Kit today and enjoy a clean, reliable ride!