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Start ShoppingCOMETIC C9133 Evo Sportster EST Gasket Kit - High-Performance Gasket Kit for Harley-Davidson
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Description
Upgrade your Harley-Davidson Evo Sportster EST's engine reliability with COMETIC's C9133 gasket kit. This high-performance solution delivers exceptional sealing capabilities to prevent leaks and ensure optimal engine operation under demanding conditions.
Key Features
- High-Durability EPDM and Silicone Materials: Resists heat, oil, and aging for long-lasting performance in extreme environments.
- Precision-Engineered for Perfect Fit: CNC-machined components ensure flawless installation and maximum sealing efficiency.
- Complete Gasket Kit for All Essential Components: Includes all necessary seals for engine longevity and hassle-free maintenance.
Why Choose This Product
Cometic's C9133 kit is engineered for riders who demand peak performance from their Sportster EST. The combination of advanced materials and precise manufacturing ensures reliable sealing, reducing the risk of engine damage and costly repairs. Whether you're tackling long rides or racing, this kit provides the durability and performance needed to keep your engine running smoothly.
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Upgrade your Harley-Davidson Evo Sportster EST's engine reliability with COMETIC's C9133 gasket kit. This high-performance solution delivers exceptional sealing capabilities to prevent leaks and ensure optimal engine operation under demanding conditions.
Key Features
- High-Durability EPDM and Silicone Materials: Resists heat, oil, and aging for long-lasting performance in extreme environments.
- Precision-Engineered for Perfect Fit: CNC-machined components ensure flawless installation and maximum sealing efficiency.
- Complete Gasket Kit for All Essential Components: Includes all necessary seals for engine longevity and hassle-free maintenance.
Why Choose This Product
Cometic's C9133 kit is engineered for riders who demand peak performance from their Sportster EST. The combination of advanced materials and precise manufacturing ensures reliable sealing, reducing the risk of engine damage and costly repairs. Whether you're tackling long rides or racing, this kit provides the durability and performance needed to keep your engine running smoothly.
| SKU | GM7F7390A6 |
|---|---|
| MPN | C9133 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster XLH | 1986-1990 |
| Harley-Davidson | Sportster XLS | 1986-1990 |
| Harley-Davidson | Sportster XL | 1986-1990 |
Frequently Asked Questions
Complete top-end and bottom-end gasket set for Evo Sportster including MLS head gasket, base gaskets, exhaust gaskets, and all seals/O-rings.
Designed for stock bore; for big bore (e.g., 883 to 1200), check Cometic for specific oversized head gasket part number.
Specifically for EST (electronic spark timing) Evolution Sportsters 1986-1990.
C9133 is for EST models; C9132 for earlier rubberband ignition models.
Installation Guide
Difficulty
Medium
Est. Time
3 hr 0 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- feeler gauges
- engine stand (recommended)
Pro Tips
- Apply thin layer of assembly lube to bearings/crank; torque head bolts in crisscross pattern; consider ARP head studs for high compression builds
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Incorrect torque sequence on head bolts
- Reusing old bolts without checking stretch
Comparison vs Stock/OEM
Aftermarket MLS construction vs. OEM composite/paper gaskets
Improvements
- Superior sealing under high compression/pressure
- Better heat resistance
- Reusable in some cases with proper care
Considerations
- Requires precise torque; more expensive than OEM
Durability & Warranty
Expected Lifespan
Engine rebuild lifespan (50,000+ miles with proper install)
Warranty
Cometic 1-year unlimited mileage warranty
Maintenance
Inspect during routine service; no specific maintenance beyond standard engine care
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