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Start ShoppingCometic C9309F5 Primary Cover Gasket - High-Performance Replacement for Harley-Davidson Big Twin Engines
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Description
Ensure optimal engine performance and reliability with this premium primary cover gasket designed for Harley-Davidson Big Twin engines. The Cometic C9309F5 delivers exceptional sealing capabilities to prevent leaks and maintain peak engine efficiency.
Key Features
- Durable Cometic F5 Fiber Material: Engineered to withstand extreme temperatures and pressures, providing long-lasting sealing performance.
- Compatibility with Multiple Engine Families: Precision-fit for Panhead, Shovelhead, and Evolution (Evo) Big Twin models.
- Single-Use Design: Ensures proper sealing by replacing the gasket whenever the cover is removed.
Why Choose This Product
Upgrade your engine maintenance with a gasket that combines advanced material technology with precise engineering. This replacement ensures reliable sealing, prevents oil leaks, and maintains engine integrity for riders who demand performance and durability from their Harley-Davidson Big Twin. Perfect for both regular maintenance and restoration projects.
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Ensure optimal engine performance and reliability with this premium primary cover gasket designed for Harley-Davidson Big Twin engines. The Cometic C9309F5 delivers exceptional sealing capabilities to prevent leaks and maintain peak engine efficiency.
Key Features
- Durable Cometic F5 Fiber Material: Engineered to withstand extreme temperatures and pressures, providing long-lasting sealing performance.
- Compatibility with Multiple Engine Families: Precision-fit for Panhead, Shovelhead, and Evolution (Evo) Big Twin models.
- Single-Use Design: Ensures proper sealing by replacing the gasket whenever the cover is removed.
Why Choose This Product
Upgrade your engine maintenance with a gasket that combines advanced material technology with precise engineering. This replacement ensures reliable sealing, prevents oil leaks, and maintains engine integrity for riders who demand performance and durability from their Harley-Davidson Big Twin. Perfect for both regular maintenance and restoration projects.| SKU | GM9F062606 |
|---|---|
| MPN | C9309F5 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Frequently Asked Questions
No. Like most primary cover gaskets, the Cometic C9309F5 is intended as a one‑time‑use gasket. It should be replaced any time the primary cover is removed to ensure a reliable seal.
In most Harley‑Davidson primary applications, the gasket is installed dry on clean, oil‑free surfaces. Follow your factory service manual and any Cometic instructions; over‑use of sealant can cause leaks or clog passages.
C9309F5 is sold as a primary cover gasket only in most listings. Derby cover gaskets, inspection cover gaskets, drain plug O‑rings, and mainshaft or shifter shaft seals are typically sold separately or as part of a full primary gasket kit.
If the leak is from the primary cover gasket surface and the cover and case are not warped or damaged, replacing the old gasket with a new Cometic C9309F5 and properly torquing the fasteners often resolves the leak. If the leak is from a seal or O‑ring, those components may also need replacement.
On most Harley Big Twin models, you should drain the primary fluid before removing the primary cover to avoid a mess and to ensure a clean, dry sealing surface. Refill with the correct fluid and quantity during reassembly.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- Basic SAE hand tool set (Allen/hex keys, sockets, combination wrenches)
- Torque wrench (inch‑lb and/or ft‑lb depending on model)
- Gasket scraper or plastic razor scraper
- Brake cleaner or degreaser
- Shop rags
- Oil drain pan (if draining primary fluid)
Pro Tips
- Thoroughly clean both gasket surfaces with a plastic scraper and solvent; they should be smooth, dry, and oil‑free before the new gasket goes on.
- Test‑fit the gasket on the cover to ensure all bolt holes and passages line up before putting it against the engine case.
- Tighten primary cover bolts in a criss‑cross pattern and use factory torque specs from the service manual to prevent warping and leaks.
- Refill the primary with the correct type and quantity of primary fluid after installation and check for leaks after the first short ride.
- If your model uses additional small inspection or derby cover gaskets, replace them at the same time to avoid having to reopen the primary soon after.
Common Mistakes to Avoid
- Re‑using the old primary gasket instead of installing the new Cometic gasket
- Not cleaning old gasket material and sealant completely from both mating surfaces
- Over‑tightening or unevenly tightening primary cover fasteners, which can warp the cover or squeeze out the gasket
- Installing the gasket dry on oily or contaminated surfaces, which can lead to leaks
- Forgetting to inspect or replace the primary cover O‑rings and seals (derby cover, inspection cover, drain plug) at the same time
Comparison vs Stock/OEM
Functionally equivalent to OEM Harley‑Davidson primary cover gaskets in sealing performance when installed correctly.
Improvements
- Aftermarket Cometic gasket typically priced lower than OEM while offering comparable sealing performance.
- Cometic is widely used in performance and racing applications, so quality and consistency are generally considered on par with or better than many OEM paper gaskets.
Considerations
- Always verify the exact Harley OEM part number and model/year fitment before substituting an aftermarket gasket.
- For restorations where OEM originality is critical, some owners may still prefer genuine Harley gaskets.
Durability & Warranty
Expected Lifespan
Designed to last until the next primary cover removal, assuming proper installation and no damage or warping of mating surfaces.
Warranty
Typical aftermarket gasket warranty is limited and covers manufacturing defects only; check with the specific retailer or Cometic for current terms.
Maintenance
No maintenance required on the gasket itself; periodically inspect the primary area for signs of leaks and address promptly.
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