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Start ShoppingCometic C9645F Twin Cam Transmission Gasket - MLS Steel with Silicone Beading for Reliable Sealing
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Description
Ensure optimal performance and longevity for your Twin Cam engine with Cometic's premium transmission gasket. Engineered for precision sealing and durability, this essential component prevents leaks and maintains peak power delivery during high-stress riding conditions.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing strength and resistance to heat, oil, and pressure for long-lasting performance.
- Silicone Beading Design: Enhances sealing integrity around critical drive gear and bearing race areas, reducing the risk of fluid leaks.
- 0.015 in. Thickness: Optimized for proper fitment and compression in Twin Cam transmission systems.
- Lightweight Build: Weighs just 0.1 lbs for easy installation without compromising structural integrity.
Why Choose This Product
Cometic's C9645F gasket is trusted by racers and enthusiasts for its ability to handle extreme temperatures and pressures. The combination of MLS steel and silicone beading creates a durable, leak-proof seal that maintains engine efficiency and protects critical components. Perfect for high-performance applications, this gasket ensures reliable operation whether you're tackling drag strips, motocross tracks, or street riding.
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Ensure optimal performance and longevity for your Twin Cam engine with Cometic's premium transmission gasket. Engineered for precision sealing and durability, this essential component prevents leaks and maintains peak power delivery during high-stress riding conditions.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior sealing strength and resistance to heat, oil, and pressure for long-lasting performance.
- Silicone Beading Design: Enhances sealing integrity around critical drive gear and bearing race areas, reducing the risk of fluid leaks.
- 0.015 in. Thickness: Optimized for proper fitment and compression in Twin Cam transmission systems.
- Lightweight Build: Weighs just 0.1 lbs for easy installation without compromising structural integrity.
Why Choose This Product
Cometic's C9645F gasket is trusted by racers and enthusiasts for its ability to handle extreme temperatures and pressures. The combination of MLS steel and silicone beading creates a durable, leak-proof seal that maintains engine efficiency and protects critical components. Perfect for high-performance applications, this gasket ensures reliable operation whether you're tackling drag strips, motocross tracks, or street riding.| SKU | GM249604CE |
|---|---|
| MPN | C9645F |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | FXD Dyna Super Glide | 1999-2006 |
| Harley-Davidson | FXDC Dyna Super Glide Custom | 1999-2006 |
| Harley-Davidson | FXD Dyna Super Glide | 2006-2017 |
| Harley-Davidson | FXDX Dyna Super Glide Sport | 1999-2005 |
| Harley-Davidson | FXDWG Dyna Wide Glide | 2006-2008 |
| Harley-Davidson | FXDL Dyna Low Rider | 2000-2005 |
| Harley-Davidson | FXDL Dyna Low Rider | 2006-2017 |
| Harley-Davidson | FXDV Dyna Vibration | 1999-2003 |
| Harley-Davidson | FXDBI Dyna Street Bob | 2004-2005 |
| Harley-Davidson | FXDB Dyna Street Bob | 2006-2017 |
| Harley-Davidson | FXDXT Dyna Super Glide T Sport | 1999-2005 |
| Harley-Davidson | FLD Dyna Switchback | 2001-2005 |
| Harley-Davidson | FLHC Heritage Softail Classic | 2008-2011 |
| Harley-Davidson | FLSTC Heritage Softail Classic | 2007-2017 |
| Harley-Davidson | FLSTN Heritage Softail Special | 2007-2017 |
| Harley-Davidson | FLSTSB Softail Cross Bones | 2006-2011 |
| Harley-Davidson | FLSTSE CVO/SE Softail Convertible | 2009-2017 |
| Harley-Davidson | FLSTI Heritage Softail | 2001-2006 |
| Harley-Davidson | FLSTN Heritage Softail Special | 2006-2011 |
| Harley-Davidson | FLSTC Heritage Softail Classic | 2007-2017 |
Frequently Asked Questions
Yes, compatible with 1999-2017 Twin Cam Dyna models. Confirm your exact model in fitment list.
0.015" MLS construction; stock is often paper at ~0.010". Provides better sealing for high-performance builds.
Recommended during transmission work, but not required if in good condition.
Yes, fits standard Twin Cam main drive gear setups.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- socket set (3/8" drive)
- torque wrench
- gasket scraper
- Harley transmission cover tool (optional)
- RTV sealant (for corners)
Pro Tips
- Clean all surfaces with brake cleaner and plastic scraper. Apply thin layer of RTV at case corners. Torque in crisscross pattern to spec (15-18 ft-lbs typically).
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Over-torquing bolts leading to distortion
- Reusing old bolts without checking threads
Comparison vs Stock/OEM
Replaces fragile OEM paper gasket with durable MLS construction
Improvements
- Superior sealing under high heat/pressure
- Resists blowouts in modified engines
- Longer service life
Considerations
- Slightly thicker; may require shim adjustment in tight builds
Durability & Warranty
Expected Lifespan
Engine life (50,000+ miles with proper install)
Warranty
1 year manufacturer defect warranty
Maintenance
Inspect during transmission service; no regular maintenance needed
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