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Start ShoppingCometic C9261 Evo Big Twin Starter Shaft Seal - High-Performance Oil Seal for Harley-Davidson
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Description
Keep your Harley-Davidson Big Twin Evo running smoothly with this high-performance starter shaft seal. Designed to prevent oil leaks and ensure reliable operation, this Cometic seal is built to withstand the rigors of motorcycle use.
Key Features
- Material: Nitrile rubber with reinforced metal core for exceptional durability and resistance to heat, oil, and wear.
- Application: Precision-fit for OEM Harley-Davidson Big Twin Evo starter/jackshaft bore at the primary case.
- Seal Type: Oil-resistant oil seal with a secure, long-lasting seal to prevent contamination and leaks.
- Fitment: Specially sized to match original equipment specifications for a perfect OEM replacement.
- Packaging: Sold individually for easy storage and replacement convenience.
Why Choose This Product
Upgrade your motorcycle's reliability with a Cometic seal engineered for maximum performance. This starter shaft seal offers superior sealing capabilities, ensuring your engine maintains optimal lubrication while preventing costly oil leaks. Its durable construction and precise fitment make it an essential part for maintaining your Big Twin Evo's efficiency and longevity.
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Keep your Harley-Davidson Big Twin Evo running smoothly with this high-performance starter shaft seal. Designed to prevent oil leaks and ensure reliable operation, this Cometic seal is built to withstand the rigors of motorcycle use.
Key Features
- Material: Nitrile rubber with reinforced metal core for exceptional durability and resistance to heat, oil, and wear.
- Application: Precision-fit for OEM Harley-Davidson Big Twin Evo starter/jackshaft bore at the primary case.
- Seal Type: Oil-resistant oil seal with a secure, long-lasting seal to prevent contamination and leaks.
- Fitment: Specially sized to match original equipment specifications for a perfect OEM replacement.
- Packaging: Sold individually for easy storage and replacement convenience.
Why Choose This Product
Upgrade your motorcycle's reliability with a Cometic seal engineered for maximum performance. This starter shaft seal offers superior sealing capabilities, ensuring your engine maintains optimal lubrication while preventing costly oil leaks. Its durable construction and precise fitment make it an essential part for maintaining your Big Twin Evo's efficiency and longevity.| SKU | GM75D47C9F |
|---|---|
| MPN | C9261 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Big Twin (Evolution) | 1989-1998 |
Frequently Asked Questions
It is designed for Evolution Big Twin applications using the OEM-style starter/jackshaft and primary. Always confirm by cross-referencing your OEM starter shaft seal part number and checking your year/model against the seller’s fitment chart.
C9261 is a single starter shaft seal sold individually. It is not a complete primary gasket or seal kit.
On most Evo Big Twin models, yes. The primary cover and starter jackshaft components must be removed to access and replace the starter shaft seal correctly.
It’s recommended to drain and replace the primary fluid. Contamination from debris or moisture is common once the primary is opened.
Typically no sealant is required on the outer diameter of a correctly sized press-fit seal. Ensure the bore is clean and dry. Use light oil only on the seal lip and shaft unless the service manual for your specific model states otherwise.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- Basic SAE hand tools (wrenches/sockets for primary cover and starter hardware)
- Allen/hex keys (for primary cover on many models)
- Seal puller or small pick (to remove old seal carefully)
- Seal driver or appropriately sized socket (to press in new seal evenly)
- Torque wrench (for primary cover and starter fasteners)
- Drain pan (if primary fluid must be drained)
- Shop rags and brake cleaner or parts cleaner
Pro Tips
- Lightly polish the starter shaft/jackshaft where the seal rides with very fine emery cloth if there are grooves or rust.
- Apply a thin film of clean primary fluid or engine oil to the seal lip and shaft before installation to prevent a dry start.
- Use a socket that contacts the metal outer diameter of the seal, not the rubber lip, when driving it in.
- Mark the original seal depth before removal and install the new seal to the same depth in the bore.
- Inspect the starter jackshaft bushing and primary cover for wear; replacing a seal alone will not fix a badly worn shaft or bore.
Common Mistakes to Avoid
- Driving the new seal in crooked, causing leaks or premature wear
- Damaging the sealing lip during installation by dragging it over sharp splines/edges
- Not cleaning the bore and shaft before installing the new seal
- Reusing a damaged or hardened primary cover gasket and then blaming the seal for leaks
- Failing to lightly lube the seal lip and shaft before reassembly
- Over-torquing or under-torquing primary cover fasteners
Comparison vs Stock/OEM
Functionally equivalent to the OEM Harley-Davidson starter shaft seal, designed as a direct replacement for Evolution Big Twin applications.
Improvements
- Cometic-focused sealing products are generally known for tight tolerances and high-quality rubber compounds.
- Often chosen by builders when doing full primary or engine gasket upgrades for improved long-term sealing.
Considerations
- Must match the correct OEM application; using the wrong seal size or type will cause leaks.
- Overall performance still depends on condition of the starter shaft, bushings, and primary cover bore.
Durability & Warranty
Expected Lifespan
Comparable to OEM when installed on a clean, undamaged shaft and bore; typically many years and tens of thousands of miles under normal use.
Warranty
Standard Cometic gasket/seal warranty via retailer or distributor; specific duration not stated by retailers for this part number.
Maintenance
Periodically inspect for oil seepage around the starter/primary area during routine service; replace if leaks develop or during major primary service.
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