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Start ShoppingCometic C9191 Evo Sportster EST Gasket Kit - MLS Head Gasket Set for Enhanced Performance
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Description
Upgrade your Evo Sportster EST engine's reliability with Cometic's C9191 gasket kit, engineered for maximum sealing efficiency and long-term performance. This complete top-end and bottom-end gasket set delivers peace of mind for riders demanding precision and durability.
Key Features
- Multi-Layer Steel (MLS) Head Gasket: Provides superior sealing under high temperatures and pressures for reliable engine operation.
- Composite Base Gasket: Offers enhanced durability and resistance to thermal cycling for consistent performance.
- One-Piece Metal Oil Pan Gasket: Ensures complete oil retention and leak prevention with reinforced construction.
- 0.040 in. (1.02mm) Head Gasket Thickness: Optimized for precise engine sealing and compatibility with OEM specifications.
- Complete Top-End and Bottom-End Set: Eliminates the need for partial replacements, saving time and labor.
Why Choose This Product
Cometic's C9191 kit is designed for riders who prioritize engine longevity and performance. The combination of MLS technology, composite materials, and precision engineering ensures exceptional sealing capabilities, reducing the risk of overheating and oil leaks. This gasket set is ideal for high-performance applications, offering a reliable solution for both daily riding and aggressive use. Its comprehensive components simplify installation while maintaining OEM-level fit and function, making it a trusted choice for mechanics and riders alike.
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Upgrade your Evo Sportster EST engine's reliability with Cometic's C9191 gasket kit, engineered for maximum sealing efficiency and long-term performance. This complete top-end and bottom-end gasket set delivers peace of mind for riders demanding precision and durability.
Key Features
- Multi-Layer Steel (MLS) Head Gasket: Provides superior sealing under high temperatures and pressures for reliable engine operation.
- Composite Base Gasket: Offers enhanced durability and resistance to thermal cycling for consistent performance.
- One-Piece Metal Oil Pan Gasket: Ensures complete oil retention and leak prevention with reinforced construction.
- 0.040 in. (1.02mm) Head Gasket Thickness: Optimized for precise engine sealing and compatibility with OEM specifications.
- Complete Top-End and Bottom-End Set: Eliminates the need for partial replacements, saving time and labor.
Why Choose This Product
Cometic's C9191 kit is designed for riders who prioritize engine longevity and performance. The combination of MLS technology, composite materials, and precision engineering ensures exceptional sealing capabilities, reducing the risk of overheating and oil leaks. This gasket set is ideal for high-performance applications, offering a reliable solution for both daily riding and aggressive use. Its comprehensive components simplify installation while maintaining OEM-level fit and function, making it a trusted choice for mechanics and riders alike.| SKU | GM883557BC |
|---|---|
| MPN | C9191 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster Evolution (XL883, XL1100) | 1986-1991 |
Frequently Asked Questions
Fits Harley-Davidson Sportster Evolution models from 1986-1991 (XL883, XL1100). Confirm your model.
Yes, features multi-layer steel (MLS) head gasket for superior sealing under high compression.
No, this is a complete pre-sized kit. No resizing required like with some competitors.
Standard Evo Sportster bore up to 3.4375 inches. Contact Cometic for oversized pistons.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- feeler gauges
Pro Tips
- Use Cometic sealant on critical gaskets like the oil pan
- Torque head bolts in criss-cross pattern to spec (typically 35-45 ft-lbs)
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Incorrect torque sequence on head bolts
Comparison vs Stock/OEM
Aftermarket performance kit vs. paper/composite OEM gaskets
Improvements
- Better sealing for high-performance builds
- MLS head gasket resists blowout
- Reusable in some cases with proper care
Considerations
- Higher cost than OEM
- Requires precise torque specs
Durability & Warranty
Expected Lifespan
Engine rebuild lifespan (50,000+ miles with proper install)
Warranty
1 year limited manufacturer warranty
Maintenance
Inspect during routine top-end service; no special maintenance
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