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Start ShoppingCOMETIC C9442 Evo Big Twin Inspection/Derby Cover Gasket - MLS Steel with Silicone Carrier
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Description
Upgrade your engine's sealing integrity with COMETIC's high-performance inspection/derby cover gasket. Engineered for Evo Big Twin applications, this MLS steel with silicone rubber carrier gasket delivers unmatched durability and reliability for long-term performance.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides exceptional heat resistance and sealing reliability for demanding engine environments.
- Silicone Rubber Carrier: Ensures flexibility and consistent sealing pressure for perfect fit and leak prevention.
- Standard Thickness (0.030 in): Optimized for precise sealing without compromising engine compartment space.
- 4.125 in Bore: Precision-engineered for perfect fit on Evo Big Twin inspection/derby covers.
- Lightweight Design (0.1 lbs): Reduces overall assembly weight while maintaining structural integrity.
Why Choose This Product
Cometic's inspection/derby cover gasket combines advanced MLS steel technology with silicone rubber for a sealing solution that withstands extreme temperatures and pressure fluctuations. Its precise 4.125 in bore ensures perfect compatibility with original equipment specifications, while the lightweight design minimizes stress on engine components. This gasket is essential for maintaining engine efficiency and preventing costly leaks in high-performance applications.
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Upgrade your engine's sealing integrity with COMETIC's high-performance inspection/derby cover gasket. Engineered for Evo Big Twin applications, this MLS steel with silicone rubber carrier gasket delivers unmatched durability and reliability for long-term performance.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides exceptional heat resistance and sealing reliability for demanding engine environments.
- Silicone Rubber Carrier: Ensures flexibility and consistent sealing pressure for perfect fit and leak prevention.
- Standard Thickness (0.030 in): Optimized for precise sealing without compromising engine compartment space.
- 4.125 in Bore: Precision-engineered for perfect fit on Evo Big Twin inspection/derby covers.
- Lightweight Design (0.1 lbs): Reduces overall assembly weight while maintaining structural integrity.
Why Choose This Product
Cometic's inspection/derby cover gasket combines advanced MLS steel technology with silicone rubber for a sealing solution that withstands extreme temperatures and pressure fluctuations. Its precise 4.125 in bore ensures perfect compatibility with original equipment specifications, while the lightweight design minimizes stress on engine components. This gasket is essential for maintaining engine efficiency and preventing costly leaks in high-performance applications.| SKU | GMF731BFE4 |
|---|---|
| MPN | C9442 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Evo Big Twin | 1986-1999 |
| Harley-Davidson | Softail (FXST, FLST) | 1986-1999 |
| Harley-Davidson | Dyna (FXD) | 1986-1999 |
| Harley-Davidson | Touring (FLT, FLH) | 1986-1999 |
Frequently Asked Questions
No, this is specifically for Evolution Big Twin engines (1986-1999). Twin Cam models use different part numbers.
This is Cometic's MLS (multi-layer steel) gasket with silicone carrier for superior sealing and durability.
Recommended but not required. OEM bolts can be reused if in good condition, but stainless steel ARP bolts are popular upgrade.
C9442 is standard 0.030" thickness. C9442-040 is 0.040" for higher compression builds.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- 8mm socket
- torque wrench
- gasket scraper
- brake cleaner
Pro Tips
- Clean both surfaces with brake cleaner and plastic scraper
- Torque to 90-120 in/lbs in crisscross pattern
- Consider replacing derby cover bolts with stainless steel
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Over-tightening bolts
- Using old bolts
Comparison vs Stock/OEM
Replaces paper fiber OEM gasket with MLS construction
Improvements
- Superior sealing - no leaks even with high torque
- Much higher heat resistance
- Will not crush or blow out
- Reusable multiple times with proper installation
Considerations
- Slightly more expensive than OEM
- Requires perfectly clean surfaces
Durability & Warranty
Expected Lifespan
Engine life (virtually indestructible)
Warranty
1 year Cometic manufacturer warranty
Maintenance
Inspect during routine service. Reusable if undamaged.
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