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Start ShoppingCOMETIC C9758F Evo Sportster EST Gasket Kit - High-Performance Gasket Kit for Motorcycle Engines
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Description
Keep your Evo Sportster EST running smoothly with this high-performance gasket kit designed for maximum durability and leak prevention. Essential for maintaining engine integrity and power delivery.
Key Features
- Complete Gasket Set: Includes critical components like head gaskets, oil pan seals, and transmission gaskets for comprehensive engine sealing.
- High-Temperature Materials: Made from reinforced silicone and EPDM compounds to withstand extreme heat and pressure without degradation.
- Perfect Fit: Precision-engineered for Evo Sportster EST models to ensure seamless installation and optimal performance.
Why Choose This Product
This gasket kit offers long-lasting reliability, preventing oil leaks and maintaining engine efficiency. Its durable construction reduces the risk of premature wear, while the complete set saves time during repairs. Ideal for riders seeking dependable performance and peace of mind on the road.
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Keep your Evo Sportster EST running smoothly with this high-performance gasket kit designed for maximum durability and leak prevention. Essential for maintaining engine integrity and power delivery.
Key Features
- Complete Gasket Set: Includes critical components like head gaskets, oil pan seals, and transmission gaskets for comprehensive engine sealing.
- High-Temperature Materials: Made from reinforced silicone and EPDM compounds to withstand extreme heat and pressure without degradation.
- Perfect Fit: Precision-engineered for Evo Sportster EST models to ensure seamless installation and optimal performance.
Why Choose This Product
This gasket kit offers long-lasting reliability, preventing oil leaks and maintaining engine efficiency. Its durable construction reduces the risk of premature wear, while the complete set saves time during repairs. Ideal for riders seeking dependable performance and peace of mind on the road.
| SKU | GM5C248714 |
|---|---|
| MPN | C9758F |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster 883 | 1986-1990 |
| Harley-Davidson | Sportster 1100 / 1200 (Evo) | 1986-1990 |
Frequently Asked Questions
Match your bike’s exact year, displacement, and ignition/EST configuration against the Cometic application guide or an online OEM parts fiche. This kit is for Evolution Sportster models with EST‑style ignition; fit can differ between early Evo years and some sub‑models.
No. C9758F is an EST/ignition‑related gasket kit for Evo Sportster applications, not a complete engine overhaul set. For full rebuilds, look for a Cometic complete or top‑end gasket kit specified as such for your year/model.
Often no; many Cometic gaskets are designed to seal dry. Use sealant only where the Harley‑Davidson service manual or Cometic instructions specifically call for it. Overuse of sealant can cause leaks or block passages.
A skilled home mechanic with a factory service manual and proper tools can usually install this kit. If you’re unfamiliar with Evo Sportster ignition and top‑end procedures or torque specs, professional installation is recommended.
Yes, Cometic gaskets are widely used in performance and racing Harley builds. Ensure the specific kit matches your compression ratio, cylinder/head configuration, and any aftermarket components you’re using.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- Harley‑specific service manual for your exact year/model
- Basic SAE hand tools (sockets, combination wrenches, Allen/hex keys, Torx bits as applicable)
- Inch‑pound and foot‑pound torque wrenches (for ignition cover / housing and related fasteners)
- Plastic or brass scraper / gasket removal tool
- Brake cleaner or non‑chlorinated parts cleaner
- Clean rags and lint‑free towels
Pro Tips
- Have the factory service manual open to the ignition/EST and top‑end sections for your exact year; follow torque specs and patterns exactly.
- Dry‑fit gaskets first to confirm hole alignment and orientation before applying any sealant or installing bolts.
- Use only the minimal sealant recommended by the manual (often none on many Cometic coated gaskets); excess sealant can squeeze into oil passages.
- Clean all mating surfaces until they are smooth, flat, and completely free of old gasket material and oil film.
- Start all bolts by hand, then snug in a criss‑cross pattern and torque in stages to avoid warping covers.
Common Mistakes to Avoid
- Reusing old, damaged, or oil‑soaked gaskets instead of fully replacing them
- Not fully removing old gasket material and sealant, causing sealing issues and oil leaks
- Over‑torquing small cover bolts and stripping threads in the aluminum cases
- Incorrect torque sequence or ignoring torque specs from the service manual
- Contaminating new gasket surfaces with oil, grease, or sealant where a dry install is specified
Comparison vs Stock/OEM
Designed as a high‑quality aftermarket replacement for OEM Harley‑Davidson Evo Sportster EST/ignition‑related gaskets.
Improvements
- Generally better material quality and consistency compared to many OEM or generic paper gaskets.
- Engineered sealing surfaces for improved resistance to oil weeping and seepage when installed on properly prepared surfaces.
- Often more complete coverage for specific service operations compared to buying individual OEM gaskets.
Considerations
- Always confirm thickness and application against OEM specs when mixing with other aftermarket performance parts.
- Follow Cometic and Harley installation guidelines—improper prep or torque can negate the advantages of upgraded gaskets.
Durability & Warranty
Expected Lifespan
Comparable to or better than OEM gaskets when installed on clean, flat surfaces and torqued to spec; typically many years of normal street use.
Warranty
Standard Cometic manufacturer warranty applies via the retailer; specific terms vary by seller.
Maintenance
Periodically inspect gasket areas for signs of oil seepage during routine services; re‑torque fasteners only if specified by the service manual.
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