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Start ShoppingCometic C9642 Twin Cam O-Ring - High-Durability Gasket Seal for Powersports Engines
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Description
Ensure reliable engine performance with Cometic's high-quality Twin Cam O-Ring. This essential gasket seal is engineered to withstand extreme conditions and deliver consistent sealing for powersports engines.
Key Features
- EPDM Material: Resists heat, oil, and aging for extended service life
- Precision Engineering: Perfect fit for Twin Cam engine applications
- Leak-Proof Seal: Prevents fluid leaks and maintains optimal engine pressure
Why Choose This Product
Cometic's Twin Cam O-Ring offers unmatched durability and reliability for powersports enthusiasts. Its advanced material composition ensures resistance to extreme temperatures and chemical exposure, while precise manufacturing guarantees a perfect fit. This essential gasket seal helps maintain engine performance, reduce maintenance costs, and extend equipment lifespan. Whether you're modifying or maintaining a Twin Cam engine, this O-ring provides peace of mind with every ride.
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Ensure reliable engine performance with Cometic's high-quality Twin Cam O-Ring. This essential gasket seal is engineered to withstand extreme conditions and deliver consistent sealing for powersports engines.
Key Features
- EPDM Material: Resists heat, oil, and aging for extended service life
- Precision Engineering: Perfect fit for Twin Cam engine applications
- Leak-Proof Seal: Prevents fluid leaks and maintains optimal engine pressure
Why Choose This Product
Cometic's Twin Cam O-Ring offers unmatched durability and reliability for powersports enthusiasts. Its advanced material composition ensures resistance to extreme temperatures and chemical exposure, while precise manufacturing guarantees a perfect fit. This essential gasket seal helps maintain engine performance, reduce maintenance costs, and extend equipment lifespan. Whether you're modifying or maintaining a Twin Cam engine, this O-ring provides peace of mind with every ride.
| SKU | GMBBD7F2EE |
|---|---|
| MPN | C9642 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Twin Cam 88/96/103/110 Engines | 1999-2017 |
| Harley-Davidson | FXD Dyna Series | 2006-2017 |
| Harley-Davidson | FL Touring Series | 2007-2017 |
Frequently Asked Questions
Yes, C9642 fits all Twin Cam 88/96/103/110 engines from 1999-2017 including Touring models.
No, this is a stock thickness 0.040" gasket. For higher compression, consider Cometic's thicker options.
C9642 has 4.000" bore for stock/overbore applications. C9256 is smaller bore 3.875" for stock pistons.
Not recommended. Use ARP head studs or new OEM torque-to-yield bolts for proper clamping force.
Yes, MLS construction handles high cylinder pressures well. Many use successfully up to 150hp nitrous.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- Torque wrench
- Socket set (3/8" drive)
- Head bolt socket
- Gasket scraper
- Torque angle gauge
- Engine oil
- Assembly lube
Pro Tips
- Clean surfaces with brake cleaner, use plastic scraper only
- Follow Harley torque specs exactly (60-65 ft-lbs final torque)
- Use M8.5 ARP head studs for easier torquing
- Check piston to valve clearance after install
- Prime oil pump before first start
Common Mistakes to Avoid
- Not cleaning cylinder head and case surfaces thoroughly
- Incorrect head bolt torque sequence
- Over-torquing head bolts
- Not using assembly lube on bearings/cam lobes
Comparison vs Stock/OEM
Multi-layer steel vs single-layer paper/composite stock gasket
Improvements
- Superior sealing under high cylinder pressure
- Better heat resistance
- No burn-through like paper gaskets
- Reusable if undamaged
- Handles overbore pistons better
Considerations
- Requires perfectly flat surfaces
- More expensive than OEM
- Professional install recommended
Durability & Warranty
Expected Lifespan
Engine life (100,000+ miles) if properly installed
Warranty
1 year manufacturer defect warranty
Maintenance
Inspect during top end service. Reusable if surfaces undamaged.
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