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Start ShoppingCOMETIC C9485 Evo O-Ring - MLS Steel Gasket with Viton Seal for High-Performance Engines
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Description
Upgrade your engine's sealing integrity with COMETIC's C9485 Evo O-Ring, engineered for maximum durability and performance in powersports applications. This full bore head gasket combines multi-layer steel construction with a high-quality Viton o-ring to ensure long-lasting reliability under extreme conditions.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides exceptional heat resistance and compression sealing for high-performance engines.
- Viton O-Ring: Offers superior chemical resistance and maintains flexibility in extreme temperatures.
- 0.048" Thickness: Ensures optimal sealing while maintaining compatibility with standard engine components.
- 85mm Bore Size: Precisely engineered for fitment in specified engine applications.
Why Choose This Product
Whether you're modifying a high-output engine or maintaining a stock setup, this gasket delivers unmatched sealing performance. The combination of MLS steel and Viton rubber resists warping and degradation, reducing the risk of head gasket failure. Its precision-engineered design ensures proper compression and coolant sealing, while the durable materials withstand high temperatures and pressures common in powersports engines. Ideal for riders who demand reliability without compromising performance.
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Upgrade your engine's sealing integrity with COMETIC's C9485 Evo O-Ring, engineered for maximum durability and performance in powersports applications. This full bore head gasket combines multi-layer steel construction with a high-quality Viton o-ring to ensure long-lasting reliability under extreme conditions.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides exceptional heat resistance and compression sealing for high-performance engines.
- Viton O-Ring: Offers superior chemical resistance and maintains flexibility in extreme temperatures.
- 0.048" Thickness: Ensures optimal sealing while maintaining compatibility with standard engine components.
- 85mm Bore Size: Precisely engineered for fitment in specified engine applications.
Why Choose This Product
Whether you're modifying a high-output engine or maintaining a stock setup, this gasket delivers unmatched sealing performance. The combination of MLS steel and Viton rubber resists warping and degradation, reducing the risk of head gasket failure. Its precision-engineered design ensures proper compression and coolant sealing, while the durable materials withstand high temperatures and pressures common in powersports engines. Ideal for riders who demand reliability without compromising performance.| SKU | GM79529E8F |
|---|---|
| MPN | C9485 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster XL883 / XL1100 Evolution | 1986-1994 |
| Harley-Davidson | Sportster XL1200 Evolution | 1986-1994 |
Frequently Asked Questions
Yes, direct replacement for 1986-1994 Evolution Sportster models with 85mm bore.
Yes, but head and case surfaces must be perfectly flat (within 0.002"). MLS gaskets are less forgiving than composite.
C9485 includes the o-ring. C9485SP is the same gasket without o-ring.
Yes, rated for up to 13:1 compression ratios when properly installed.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- torque wrench
- feeler gauges
- gasket scraper
- head bolt socket set
Pro Tips
- Surfaces must be within 0.002" flatness
- Use Cometic assembly lube on o-ring
- Follow Harley torque specs exactly
Common Mistakes to Avoid
- Not cleaning surfaces completely
- Incorrect torque sequence
- Over-torquing MLS gasket
Comparison vs Stock/OEM
Multi-layer steel vs single layer composite. Much better for high heat/high boost applications
Improvements
- Superior sealing under high cylinder pressure
- Better heat resistance
- Handles high compression ratios
- Longer service life
Considerations
- Requires perfectly flat surfaces
- More expensive than OEM
Durability & Warranty
Expected Lifespan
Engine life when properly installed
Warranty
1 year Cometic warranty
Maintenance
Inspect during valve adjustments. Replace if damaged
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