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Start ShoppingCOMETIC C9667 Evo O-Ring - MLS Head Gasket with Silicone O-Ring for Harley-Davidson Evolution Engines
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Description
Upgrade your Harley-Davidson Evolution engine's sealing performance with COMETIC's C9667 Evo O-Ring. This high-quality MLS head gasket with silicone O-ring delivers exceptional durability and reliability for power sports enthusiasts demanding peak engine performance.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior heat resistance and sealing integrity for long-lasting engine performance.
- 0.040 in. (1.02mm) Thickness: Optimized compression for perfect sealing without excessive engine stress.
- 97mm Bore Size: Precision-engineered fit for Harley-Davidson Evolution engines.
- Siicone Rubber O-Ring: Resists degradation from heat and oil, ensuring consistent sealing under extreme conditions.
Why Choose This Product
Cometic's Evo O-Ring combines advanced MLS technology with durable silicone sealing to prevent leaks and maintain compression. Its precise 97mm bore size ensures a perfect fit for Harley-Davidson Evolution engines, while the 0.040 in. thickness balances sealing effectiveness with engine longevity. Riders benefit from enhanced reliability, reduced maintenance, and improved engine efficiency with this professional-grade gasket solution.
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Upgrade your Harley-Davidson Evolution engine's sealing performance with COMETIC's C9667 Evo O-Ring. This high-quality MLS head gasket with silicone O-ring delivers exceptional durability and reliability for power sports enthusiasts demanding peak engine performance.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides superior heat resistance and sealing integrity for long-lasting engine performance.
- 0.040 in. (1.02mm) Thickness: Optimized compression for perfect sealing without excessive engine stress.
- 97mm Bore Size: Precision-engineered fit for Harley-Davidson Evolution engines.
- Siicone Rubber O-Ring: Resists degradation from heat and oil, ensuring consistent sealing under extreme conditions.
Why Choose This Product
Cometic's Evo O-Ring combines advanced MLS technology with durable silicone sealing to prevent leaks and maintain compression. Its precise 97mm bore size ensures a perfect fit for Harley-Davidson Evolution engines, while the 0.040 in. thickness balances sealing effectiveness with engine longevity. Riders benefit from enhanced reliability, reduced maintenance, and improved engine efficiency with this professional-grade gasket solution.| SKU | GMFD320466 |
|---|---|
| MPN | C9667 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster (XL) | 1986-1999 |
| Harley-Davidson | Big Twin Evolution | 1984-1999 |
Frequently Asked Questions
Yes, C9667 fits all 1986-1999 Harley Sportster Evolution engines including 883/1200cc models.
0.040" thickness - confirm it matches your build specs for proper compression.
Typically no for stock builds, but check squish clearance for high compression setups.
C9667 is specifically for Evo O-ring conversion with 97mm bore; C9585 is for earlier non-O-ring heads.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- head bolt thread chaser
- piston stop tool
Pro Tips
- Apply light oil to O-ring before install
- Torque in 3 stages using crisscross pattern
- Check piston-to-valve clearance after install
Common Mistakes to Avoid
- Not cleaning surfaces thoroughly
- Incorrect torque sequence
- Overlooking O-ring lubrication
Comparison vs Stock/OEM
Multi-layer steel vs single-layer composite/paper OEM gasket
Improvements
- Superior sealing under high pressure/heat
- Better durability for performance builds
- Eliminates O-ring conversion issues
Considerations
- Requires precise surface prep unlike forgiving OEM
Durability & Warranty
Expected Lifespan
Engine rebuild lifespan (50,000+ miles typical)
Warranty
1 year limited manufacturer defect warranty
Maintenance
Inspect during valve adjustments; replace with any head removal
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