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Start ShoppingCometic C9276 Evo Sportster Rocker Cover Gasket - High-Performance MLS-Style Gasket for Harley-Davidson Engines
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Description
Upgrade your Harley-Davidson Evolution Sportster's engine performance with Cometic's C9276 rocker cover gasket. This high-performance MLS-style gasket ensures optimal sealing, durability, and reliability for top-end engine maintenance and upgrades.
Key Features
- MLS-Style Fiber Composite Material: Advanced material construction provides exceptional sealing and heat resistance for long-lasting performance.
- Re-Usable High-Density Design: Engineered for repeated use without compromising integrity, reducing long-term costs.
- Black/Dark Composite Color: Durable, heat-resistant finish maintains structural integrity under extreme engine conditions.
- Sold Individually: Single-unit packaging simplifies inventory management and ensures precise replacement.
- Engineered for Harley-Davidson Evolution Sportster: Precision-machined for perfect fitment on specific engine models.
Why Choose This Product
Cometic's C9276 gasket delivers unmatched sealing reliability and performance for motorcycle enthusiasts. Its MLS-style construction minimizes compression leaks, while the high-density material resists warping and degradation. Ideal for both routine maintenance and performance modifications, this gasket ensures your engine operates at peak efficiency with reduced risk of failure. The re-usable design also makes it a cost-effective solution for frequent engine work.
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Upgrade your Harley-Davidson Evolution Sportster's engine performance with Cometic's C9276 rocker cover gasket. This high-performance MLS-style gasket ensures optimal sealing, durability, and reliability for top-end engine maintenance and upgrades.
Key Features
- MLS-Style Fiber Composite Material: Advanced material construction provides exceptional sealing and heat resistance for long-lasting performance.
- Re-Usable High-Density Design: Engineered for repeated use without compromising integrity, reducing long-term costs.
- Black/Dark Composite Color: Durable, heat-resistant finish maintains structural integrity under extreme engine conditions.
- Sold Individually: Single-unit packaging simplifies inventory management and ensures precise replacement.
- Engineered for Harley-Davidson Evolution Sportster: Precision-machined for perfect fitment on specific engine models.
Why Choose This Product
Cometic's C9276 gasket delivers unmatched sealing reliability and performance for motorcycle enthusiasts. Its MLS-style construction minimizes compression leaks, while the high-density material resists warping and degradation. Ideal for both routine maintenance and performance modifications, this gasket ensures your engine operates at peak efficiency with reduced risk of failure. The re-usable design also makes it a cost-effective solution for frequent engine work.| SKU | GM27C01C50 |
|---|---|
| MPN | C9276 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster | 1986-1990 |
| Harley-Davidson | Sportster | 1986-1990 |
| Harley-Davidson | Sportster | 1986-1990 |
Frequently Asked Questions
No. It is designed for Evolution Sportster engines (late 1980s era). Always verify by year, model, and engine (Evo XL 883/1100/1200) and cross‑check with a detailed fitment chart or your OEM part number.
Cometic performance gaskets are more durable than many OEM paper gaskets and can sometimes be reused if undamaged, but best practice on rocker cover service is to treat them as one‑time use for maximum sealing reliability.
On clean, flat surfaces you typically install the Cometic gasket dry. Only use sealant where the Harley-Davidson service manual specifically recommends (usually at corners or joint transitions). Excess sealant can cause leaks or block oil passages.
Yes. Evo Sportster rocker covers are normally serviced with the engine in the frame, but access can be tight. Removing the tank and some surrounding components usually makes the job easier.
C9276 is a single rocker cover gasket. For full top-end service, Cometic sells complete gasket kits that include head, base, rocker, and other gaskets and seals.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 30 min
Tools Required
- SAE socket set (1/4" and 3/8" drive)
- Combination wrenches (SAE)
- Torque wrench (inch‑pound and/or foot‑pound per H-D spec)
- Allen/hex key set (SAE)
- Plastic scraper or razor blade
- Brake cleaner or gasket remover
- Shop towels
- Service manual for torque specs and sequence
Pro Tips
- Use the Harley-Davidson factory service manual for exact torque values and tightening order.
- Clean mating surfaces until completely free of old gasket and oil; wipe with brake cleaner before assembly.
- Hand‑start all bolts, then snug in a cross pattern in several stages to final torque.
- Allow the bike to fully cool after first few heat cycles and re‑check for any signs of seepage.
- If using any sealant, only apply a very thin film where the manual specifically calls for it; Cometic gaskets are designed to seal with minimal or no sealant on flat, clean surfaces.
Common Mistakes to Avoid
- Not thoroughly cleaning the old gasket material and oil from sealing surfaces
- Over‑tightening rocker box bolts and warping the cover
- Ignoring factory torque sequence which can cause leaks or noise
- Re‑using old, flattened rocker cover gaskets
- Installing gasket dry on oily surfaces, leading to seepage
Comparison vs Stock/OEM
Cometic performance gaskets typically offer better sealing, more heat resistance, and improved long‑term durability compared to stock paper-style Harley-Davidson rocker cover gaskets.
Improvements
- Higher‑quality composite materials for better oil sealing
- Better resistance to heat and repeated heat cycles
- Reduced likelihood of seepage at rocker box edges over time
Considerations
- Must still follow proper torque specs and sequence; improper installation can negate any advantage.
- For absolute OEM originality (restorations), Harley-branded gaskets may be preferred, though performance is often better with Cometic.
Durability & Warranty
Expected Lifespan
Often lasts many years and tens of thousands of miles when installed correctly on flat, undamaged surfaces.
Warranty
Standard Cometic limited manufacturer warranty (coverage terms vary by seller; check retailer or Cometic directly).
Maintenance
Periodically inspect rocker box area for signs of oil seepage, especially after the first few heat cycles. Re‑torque fasteners only if the service manual allows; do not exceed specified torque.
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