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Start ShoppingCOMETIC Evo Big Twin Transmission Gasket - MLS Steel with Silicone Carrier for Harley-Davidson (1965-1999)
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Description
Upgrade your Harley-Davidson Big Twin Evolution's transmission system with this high-performance gasket engineered for reliability and longevity. Perfect for riders seeking to maintain optimal power delivery and prevent fluid leaks in classic and vintage motorcycles.
Key Features
- Multi-Layer Steel (MLS) Construction: Combines steel layers with silicone rubber for superior sealing under high temperatures and pressure.
- 0.030" Thickness: Standard thickness ensures proper fitment without compromising sealing integrity.
- Transmission Main Drive Gear Compatibility: Specifically designed for main shaft and drive gear applications in Big Twin Evolution transmissions.
- 1965-1999 Harley-Davidson Fitment: Universal compatibility across decades of Big Twin models.
Why Choose This Product
Cometic's MLS gasket technology delivers unmatched durability and leak resistance, critical for maintaining transmission efficiency. The silicone rubber carrier provides flexibility to accommodate engine movement, while the steel layers ensure long-term sealing under extreme conditions. This gasket is essential for riders who demand precision engineering and reliability in their classic Harley-Davidson builds.
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Upgrade your Harley-Davidson Big Twin Evolution's transmission system with this high-performance gasket engineered for reliability and longevity. Perfect for riders seeking to maintain optimal power delivery and prevent fluid leaks in classic and vintage motorcycles.
Key Features
- Multi-Layer Steel (MLS) Construction: Combines steel layers with silicone rubber for superior sealing under high temperatures and pressure.
- 0.030" Thickness: Standard thickness ensures proper fitment without compromising sealing integrity.
- Transmission Main Drive Gear Compatibility: Specifically designed for main shaft and drive gear applications in Big Twin Evolution transmissions.
- 1965-1999 Harley-Davidson Fitment: Universal compatibility across decades of Big Twin models.
Why Choose This Product
Cometic's MLS gasket technology delivers unmatched durability and leak resistance, critical for maintaining transmission efficiency. The silicone rubber carrier provides flexibility to accommodate engine movement, while the steel layers ensure long-term sealing under extreme conditions. This gasket is essential for riders who demand precision engineering and reliability in their classic Harley-Davidson builds.| SKU | GMFF6A2235 |
|---|---|
| MPN | C9488F |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Big Twin Evolution (Evo) models including Electra Glide, Softail, Dyna, Sportster (select) | 1965-1999 |
Frequently Asked Questions
Yes, C9488F fits 1965-1999 Evo Big Twin 4/5-speed transmissions including most Softail models. Verify your exact transmission type.
Standard 0.030" thickness matches OEM specs for most applications. Cometic offers thicker options if needed for clearance.
Recommended: Use Harley-approved anaerobic sealant on both sides for optimal sealing, especially on aluminum cases.
Yes, compatible with both 4-speed and 5-speed Big Twin Evo transmissions from 1965-1999.
Installation Guide
Difficulty
Medium
Est. Time
45 min
Tools Required
- socket set (3/8" drive)
- torque wrench
- gasket scraper
- Harley transmission sealant
- Allen keys
Pro Tips
- Apply thin layer of anaerobic sealant to both sides
- Torque main case bolts to 14-21 ft-lbs in crisscross pattern
- Replace transmission cover gasket at same time
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Over-torquing bolts leading to distortion
- Reusing old O-rings or seals
Comparison vs Stock/OEM
MLS construction vs. stock paper/composite; superior sealing and heat resistance
Improvements
- No compression set over time
- Better tolerance to high torque
- Resists fuel/alcohol permeation
Considerations
- Requires proper sealant application unlike paper gaskets
Durability & Warranty
Expected Lifespan
Transmission rebuild lifespan (100,000+ miles with proper install)
Warranty
1 year manufacturer defect warranty from Cometic
Maintenance
Inspect during transmission service; no routine maintenance needed
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