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Start ShoppingCOMETIC C9145F1 Evo Big Twin/Twin Cam Primary Housing Gasket - High-Performance Engine Sealing Solution
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Description
Upgrade your engine's reliability with the COMETIC C9145F1 Primary Housing Gasket, engineered for Evo Big Twin and Twin Cam engines. This high-performance gasket ensures seamless sealing, preventing leaks and maintaining optimal oil flow for peak engine efficiency.
Key Features
- Heavy-Duty Material Construction: Made from premium-grade rubber and reinforced materials for long-lasting durability and resistance to heat, oil, and pressure.
- Precision-Fit Design: Perfectly molded to fit Evo Big Twin/Twin Cam primary housings, ensuring a flawless seal and eliminating oil leaks.
- Universal Compatibility: Designed for specific engine models, providing a reliable solution for maintenance and rebuilds.
- Easy Installation: Simple to replace without requiring specialized tools, saving time and labor during repairs.
Why Choose This Product
Cometic's reputation for quality ensures this gasket delivers superior performance and longevity. Its advanced design prevents oil leaks, maintains engine efficiency, and reduces the risk of costly repairs. Ideal for riders seeking dependable, high-performance parts that meet strict industry standards.
SKU:
GM65A199FA
MPN:
C9145F1
UPC:
191070001650
Category:
Gaskets/Seals
Brand:
Cometic
Stock:
In Stock
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Upgrade your engine's reliability with the COMETIC C9145F1 Primary Housing Gasket, engineered for Evo Big Twin and Twin Cam engines. This high-performance gasket ensures seamless sealing, preventing leaks and maintaining optimal oil flow for peak engine efficiency.
Key Features
- Heavy-Duty Material Construction: Made from premium-grade rubber and reinforced materials for long-lasting durability and resistance to heat, oil, and pressure.
- Precision-Fit Design: Perfectly molded to fit Evo Big Twin/Twin Cam primary housings, ensuring a flawless seal and eliminating oil leaks.
- Universal Compatibility: Designed for specific engine models, providing a reliable solution for maintenance and rebuilds.
- Easy Installation: Simple to replace without requiring specialized tools, saving time and labor during repairs.
Why Choose This Product
Cometic's reputation for quality ensures this gasket delivers superior performance and longevity. Its advanced design prevents oil leaks, maintains engine efficiency, and reduces the risk of costly repairs. Ideal for riders seeking dependable, high-performance parts that meet strict industry standards.
| SKU | GM65A199FA |
|---|---|
| MPN | C9145F1 |
| UPC/GTIN | 191070001650 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Softail (select Big Twin/Twin Cam models) | 2007-2017 |
| Harley-Davidson | Dyna (select Big Twin/Twin Cam models) | 2007-2016 |
| Harley-Davidson | Touring (select Big Twin/Twin Cam models) | 2007-2016 |
Frequently Asked Questions
It fits specific Evo Big Twin and Twin Cam Harley-Davidson primary covers. Always confirm by cross‑referencing your OEM primary gasket part number with Cometic’s catalog or a retailer fitment tool before ordering.
No. It is intended as a one‑time‑use primary cover gasket. Replace it any time the primary cover is removed to maintain a proper seal.
In most cases you install it dry on clean surfaces. Follow your Harley service manual; only apply sealant where the OEM procedure specifies, not over the entire gasket surface.
No. C9145F1 is the main primary housing/cover gasket only. Derby and inspection cover gaskets must be purchased separately.
Cometic is a premium aftermarket gasket manufacturer; their AFM/fiber primary gaskets generally meet or exceed OEM sealing performance when installed on clean, flat surfaces and torqued correctly.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 30 min
Tools Required
- Harley service manual or torque chart
- Basic metric/SAE socket set
- Allen/hex sockets for primary cover bolts
- Torque wrench (inch‑lb and ft‑lb recommended)
- Drain pan
- Primary fluid (for refill)
- Gasket scraper or plastic scraper
- Brake cleaner or gasket surface cleaner
- Shop rags
Pro Tips
- Lay the gasket on the cover dry; Cometic AFM/fiber gaskets are designed to seal without RTV on the sealing surface—only use sealant where the service manual explicitly calls for it.
- Use a criss‑cross/step torque pattern on the primary cover bolts to avoid distortion.
- Inspect the primary cover for nicks or grooves at the sealing surface; dress lightly with a flat stone if required.
- Always drain and refill primary fluid with the correct type and quantity; a primary service is a good time to change fluid and inspect chain tension.
- Do a quick leak check after the first short ride and re‑torque cover bolts to spec if your service manual allows it.
Common Mistakes to Avoid
- Reusing old primary cover gasket instead of replacing with new
- Not cleaning old gasket material and sealant fully from both mating surfaces
- Over‑tightening or unevenly tightening primary cover bolts, causing warping or leaks
- Not replacing or inspecting primary cover o‑rings and derby cover gasket at the same time
- Failing to torque compensator, clutch hub, and chain adjuster per factory specs during reassembly (when removed)
Comparison vs Stock/OEM
Designed as a direct‑replacement primary housing gasket with OEM‑equivalent or better sealing performance on Harley Big Twin/Twin Cam models.
Improvements
- High‑quality AFM/fiber construction for consistent sealing under heat and vibration
- Resistant to primary fluid and common chemicals used during service
- Precision cut to match OEM primary cover profiles for easier installation
Considerations
- Not reusable; must be replaced each time the primary cover is removed
- Sealing performance depends heavily on surface cleanliness and correct torque, just as with OEM
Durability & Warranty
Expected Lifespan
Intended to last the full service interval of the primary once installed; typically until the next time the primary cover is removed for service or repair.
Warranty
Standard Cometic limited manufacturer warranty against defects in materials and workmanship (duration and terms determined by Cometic and selling retailer).
Maintenance
No ongoing maintenance for the gasket itself; periodically inspect the primary area for signs of fluid seepage during routine service.
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