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Start ShoppingCometic C9643F Twin Cam Carb/EFI Gasket - High-Performance Engine Sealing Solution
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Description
Ensure flawless engine performance with Cometic's C9643F Twin Cam Carb/EFI Gasket, engineered to deliver superior sealing and durability for Harley-Davidson engines. This essential component is built to withstand the rigors of high-performance riding while maintaining compatibility with both fuel systems.
Key Features
- Cometic Fiber & Elastomer Construction: High-density fiber with elastomer coating provides exceptional sealing properties and resistance to heat, oil, and fuel degradation.
- Universal Fuel System Compatibility: Precision-engineered for seamless integration with both carbureted and EFI Twin Cam engines, eliminating the need for multiple gasket types.
- Precision Fitment: Designed to match original equipment specifications, ensuring perfect alignment and leak-free operation in Twin Cam applications.
- Long-Lasting Durability: Resists compression set and maintains structural integrity under extreme operating conditions, reducing the need for frequent replacements.
Why Choose This Product
Cometic's C9643F gasket is trusted by riders worldwide for its ability to enhance engine reliability and performance. Whether you're maintaining a classic carbureted Twin Cam or upgrading to EFI, this gasket offers unmatched sealing efficiency, thermal stability, and compatibility. Its advanced material composition ensures it withstands high temperatures and fuel exposure, making it ideal for demanding powersports applications. As part of Cometic's premium gasket lineup, this product delivers the precision and durability needed to keep your Harley-Davidson engine running smoothly for years.
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Ensure flawless engine performance with Cometic's C9643F Twin Cam Carb/EFI Gasket, engineered to deliver superior sealing and durability for Harley-Davidson engines. This essential component is built to withstand the rigors of high-performance riding while maintaining compatibility with both fuel systems.
Key Features
- Cometic Fiber & Elastomer Construction: High-density fiber with elastomer coating provides exceptional sealing properties and resistance to heat, oil, and fuel degradation.
- Universal Fuel System Compatibility: Precision-engineered for seamless integration with both carbureted and EFI Twin Cam engines, eliminating the need for multiple gasket types.
- Precision Fitment: Designed to match original equipment specifications, ensuring perfect alignment and leak-free operation in Twin Cam applications.
- Long-Lasting Durability: Resists compression set and maintains structural integrity under extreme operating conditions, reducing the need for frequent replacements.
Why Choose This Product
Cometic's C9643F gasket is trusted by riders worldwide for its ability to enhance engine reliability and performance. Whether you're maintaining a classic carbureted Twin Cam or upgrading to EFI, this gasket offers unmatched sealing efficiency, thermal stability, and compatibility. Its advanced material composition ensures it withstands high temperatures and fuel exposure, making it ideal for demanding powersports applications. As part of Cometic's premium gasket lineup, this product delivers the precision and durability needed to keep your Harley-Davidson engine running smoothly for years.| SKU | GM749FC652 |
|---|---|
| MPN | C9643F |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Twin Cam 88 (various models) | 1999-2006 |
| Harley-Davidson | Twin Cam 96/103/110 (selected models) | 2007-2016 |
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- basic SAE hand tools (sockets and wrenches for Harley Big Twin)
- torque wrench (inch-lb and/or ft-lb depending on fasteners involved)
- gasket scraper or plastic razor blade
- brake cleaner or solvent for surface prep
- shop towels
Pro Tips
- Confirm the exact location and function of the C9643F gasket in the engine using the Cometic catalog or service manual before disassembly.
- Dry-fit the gasket to the mating surfaces to verify alignment of bolt holes and ports before final installation.
- Use a calibrated torque wrench and follow the factory torque pattern for the specific component (intake manifold, rocker box, etc.).
- Clean gasket surfaces down to bare metal and ensure they are oil-free before installing the new gasket.
- If multiple similar Cometic gaskets are being installed (e.g., in a kit), keep each part number with its intended location to avoid mixing them up.
Common Mistakes to Avoid
- Reusing old or damaged gaskets instead of installing the new Cometic piece
- Failing to clean gasket surfaces thoroughly, leading to sealing problems
- Using sealants where Cometic specifies dry installation, which can cause gasket creep or squeeze-out
- Incorrect torque sequence or torque values on mating components (intake, rocker boxes, etc.)
- Pinching or misaligning the gasket during assembly
Comparison vs Stock/OEM
Cometic gaskets are generally considered performance-oriented replacements for OEM Harley-Davidson gaskets, designed to maintain seal integrity under higher cylinder pressures and temperatures encountered with performance builds.
Improvements
- High-quality gasket materials tailored for Twin Cam applications
- Better long-term sealing under heat cycles compared with many generic aftermarket gaskets
- Compatibility with both carbureted and EFI setups on Twin Cam engines
Considerations
- Must be matched correctly to the specific Twin Cam model and year; using the wrong gasket number can cause fitment or sealing issues.
- Installation technique and surface prep are just as critical as gasket quality for leak-free performance.
Durability & Warranty
Expected Lifespan
Intended to meet or exceed OEM service life when installed on clean, flat surfaces and torqued to specification; often used in performance applications where reliability under higher loads is important.
Warranty
Typically covered by Cometic’s standard limited warranty against defects in materials and workmanship; specific terms vary by seller and region.
Maintenance
No direct maintenance; periodically inspect the engine for oil or intake leaks during routine service intervals. Re-torque related fasteners only if explicitly recommended by the service manual.
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