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Start ShoppingCOMETIC MLS Rocker Box Gasket for Harley-Davidson Evolution Big Twin - High-Performance Gasket
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Description
Upgrade your Harley-Davidson Evolution Big Twin's engine reliability with this high-performance rocker box gasket. Designed for durability and precision, this Cometic MLS gasket delivers superior sealing and long-term engine protection for power sports enthusiasts.
Key Features
- Multi-Layer Steel (MLS) Construction: Reinforced steel layers with silicone beading provide exceptional sealing resistance against heat, oil, and vibration.
- Standard 0.030 in. Thickness: Optimal compression for secure sealing without compromising engine performance or longevity.
- Exact Fit for Evolution Big Twin: Precision-engineered to match Harley-Davidson rocker box dimensions for a perfect, leak-free installation.
- Lightweight Design: Only 0.1 lbs ensures easy handling and minimal impact on engine balance.
Why Choose This Product
Cometic's MLS gasket technology combines advanced materials with meticulous engineering to prevent oil leaks, withstand extreme temperatures, and maintain engine efficiency. This essential component is critical for preserving engine integrity during high-performance riding. Its silicone beading creates a durable, flexible seal that adapts to thermal expansion, reducing the risk of failure. Whether you're modifying your bike or maintaining its original specifications, this gasket ensures reliable operation and peace of mind on the road. With precise fitment for Harley-Davidson Evolution Big Twin models, it's an indispensable upgrade for riders who demand top-tier performance and durability.
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Upgrade your Harley-Davidson Evolution Big Twin's engine reliability with this high-performance rocker box gasket. Designed for durability and precision, this Cometic MLS gasket delivers superior sealing and long-term engine protection for power sports enthusiasts.
Key Features
- Multi-Layer Steel (MLS) Construction: Reinforced steel layers with silicone beading provide exceptional sealing resistance against heat, oil, and vibration.
- Standard 0.030 in. Thickness: Optimal compression for secure sealing without compromising engine performance or longevity.
- Exact Fit for Evolution Big Twin: Precision-engineered to match Harley-Davidson rocker box dimensions for a perfect, leak-free installation.
- Lightweight Design: Only 0.1 lbs ensures easy handling and minimal impact on engine balance.
Why Choose This Product
Cometic's MLS gasket technology combines advanced materials with meticulous engineering to prevent oil leaks, withstand extreme temperatures, and maintain engine efficiency. This essential component is critical for preserving engine integrity during high-performance riding. Its silicone beading creates a durable, flexible seal that adapts to thermal expansion, reducing the risk of failure. Whether you're modifying your bike or maintaining its original specifications, this gasket ensures reliable operation and peace of mind on the road. With precise fitment for Harley-Davidson Evolution Big Twin models, it's an indispensable upgrade for riders who demand top-tier performance and durability.| SKU | GM1EF75715 |
|---|---|
| MPN | C9282 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Evolution Big Twin (FX, FL, XL models) | 1984-1999 |
Frequently Asked Questions
Yes, fits 1984-1999 Evolution Big Twin rocker boxes, including Softail models. Verify engine displacement.
0.030" thickness is standard replacement for OEM paper gaskets. Cometic offers other thicknesses if needed.
Recommended to inspect/replace if worn; Cometic MLS gaskets are more tolerant but clean threads are key.
Yes, MLS construction excels in high-performance Evo builds up to 10:1+ compression.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- socket set (3/8" drive)
- torque wrench
- gasket scraper
- Harley-specific rocker box tools
Pro Tips
- Clean surfaces with brake cleaner, no residue. Torque to spec (15-18 ft-lbs). Apply light oil to bolts. Replace with full gasket kit if doing top end.
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Over-torquing rocker box bolts
- Reusing old bolts without checking
Comparison vs Stock/OEM
Replaces fragile paper OEM gaskets with durable MLS construction
Improvements
- Superior sealing under high heat/pressure
- Resists blowouts in performance engines
- Longer service life
Considerations
- Slightly higher cost, requires clean install
Durability & Warranty
Expected Lifespan
Engine life or 50,000+ miles with proper torque/install
Warranty
1 year limited manufacturer warranty against defects
Maintenance
Inspect during valve adjustments; retorque if needed
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