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Start ShoppingCometic C9281 Evo Big Twin Rocker Box Gasket - High-Performance Upper Gasket for Harley-Davidson
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Description
Upgrade your Harley-Davidson Evo Big Twin's top-end performance with Cometic's high-quality rocker box gasket. This precision-engineered solution ensures optimal sealing and durability for demanding riders. Perfect for maintenance and resealing applications, this gasket is designed to withstand extreme temperatures and vibrations while maintaining engine efficiency.
Key Features
- Proprietary Fiber/Composite Material: Cometic's advanced blend provides superior sealing strength and resistance to thermal degradation.
- Exact Fit for Evo Big Twin: Specifically engineered for Evolution Big Twin engines (not compatible with Twin Cam or Sportster models).
- Flat Carded Packaging: Easy storage and handling with no risk of damage during transport.
- Single Gasket Design: Sold individually for straightforward installation and cost-effective replacement.
Why Choose This Product
Cometic's C9281 gasket offers unmatched reliability for Harley-Davidson enthusiasts. Its reinforced construction reduces the risk of leaks and blow-by, while the composite material maintains flexibility under pressure. This gasket is ideal for riders seeking long-term performance without compromising engine integrity. The precise fit ensures easy installation and compatibility with OEM specifications, making it a trusted choice for professional mechanics and DIY enthusiasts alike.
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Upgrade your Harley-Davidson Evo Big Twin's top-end performance with Cometic's high-quality rocker box gasket. This precision-engineered solution ensures optimal sealing and durability for demanding riders. Perfect for maintenance and resealing applications, this gasket is designed to withstand extreme temperatures and vibrations while maintaining engine efficiency.
Key Features
- Proprietary Fiber/Composite Material: Cometic's advanced blend provides superior sealing strength and resistance to thermal degradation.
- Exact Fit for Evo Big Twin: Specifically engineered for Evolution Big Twin engines (not compatible with Twin Cam or Sportster models).
- Flat Carded Packaging: Easy storage and handling with no risk of damage during transport.
- Single Gasket Design: Sold individually for straightforward installation and cost-effective replacement.
Why Choose This Product
Cometic's C9281 gasket offers unmatched reliability for Harley-Davidson enthusiasts. Its reinforced construction reduces the risk of leaks and blow-by, while the composite material maintains flexibility under pressure. This gasket is ideal for riders seeking long-term performance without compromising engine integrity. The precise fit ensures easy installation and compatibility with OEM specifications, making it a trusted choice for professional mechanics and DIY enthusiasts alike.| SKU | GME6DB74AD |
|---|---|
| MPN | C9281 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | FLT / FLHT / FLHS (Touring) | 1984-1991 |
| Harley-Davidson | FXR / FX / FXD families | 1984-1999 |
| Harley-Davidson | Softail (FXST/FLST variants) | 1986-1999 |
Frequently Asked Questions
No. The C9281 is for Harley-Davidson Evolution Big Twin engines only. It does not fit Twin Cam or Sportster motors.
Yes. The C9281 is a single rocker box gasket. A complete top‑end or full rocker box reseal typically requires gaskets for both cylinders and all rocker box sections, often supplied in a full top-end kit.
Yes. On most Evo Big Twin models, rocker box service can be done with the engine in the frame, though access may be tight on some touring and Softail models.
Follow the Harley-Davidson service manual and Cometic’s recommendations. Many Cometic rocker box gaskets are designed to be installed dry; if a sealant is used, it should be a very thin film and only where specified.
Cometic’s aftermarket gaskets are designed for improved sealing and durability versus many OEM paper gaskets, which can help reduce seepage when surfaces are clean and bolts are torqued correctly.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 30 min
Tools Required
- Harley-Davidson service manual or equivalent
- Standard and metric socket set
- Allen/hex key set (for rocker box fasteners on many Evos)
- Torque wrench (inch‑pound and foot‑pound as appropriate)
- Soft scraper or plastic razor blade for gasket removal
- Brake cleaner or gasket remover spray
- Clean shop rags
- Thread locker (medium strength, if specified by service manual)
Pro Tips
- Work on a completely cool engine to prevent warping and ensure accurate torque readings
- Lay out rocker box bolts in a labeled pattern so each bolt returns to its original location
- Dry‑fit the gasket first to understand orientation and alignment around oil passages and bolt holes
- Use a plastic scraper only on aluminum surfaces to avoid gouging the head or rocker box
- After installation, wipe everything clean and run the engine, then inspect closely for seepage around the rocker box edges
Common Mistakes to Avoid
- Reusing old rocker box gaskets instead of replacing all during service
- Over‑torquing rocker box bolts and warping the rocker box
- Not cleaning gasket surfaces completely, leading to oil leaks
- Installing the gasket backward or misaligned with oil passages
- Failing to follow the specified bolt tightening sequence and torque steps
Comparison vs Stock/OEM
Designed as a higher‑quality aftermarket replacement for OEM rocker box gaskets on Harley-Davidson Evo Big Twin engines.
Improvements
- Improved sealing materials vs many older OEM-style paper gaskets
- Better resistance to heat, oil, and pressure cycling
- More consistent thickness and sealing surface for performance or rebuilt engines
Considerations
- Requires clean, flat mating surfaces and proper torque sequence to realize benefits
- Must be the correct gasket for the specific Evo application; not interchangeable with Twin Cam or Sportster gaskets
Durability & Warranty
Expected Lifespan
Intended to last for many years and tens of thousands of miles when installed correctly on a healthy engine.
Warranty
Typical Cometic limited manufacturer warranty against defects in materials and workmanship (exact terms vary by distributor).
Maintenance
Periodically inspect rocker box area for signs of oil seepage during routine service; re-torque is generally not recommended unless specified by the service manual.
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