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Start ShoppingCometic C9308F1 Primary Cover Gasket - Durable AFM Reusable for Harley Big Twin Engines
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Description
Upgrade your Harley-Davidson Big Twin's reliability with Cometic's C9308F1 Primary Cover Gasket. This advanced AFM/fiber composite gasket delivers exceptional oil resistance and durability, ensuring seamless performance for Panhead, Shovelhead, and Evo engines. Perfect for maintaining peak engine efficiency during maintenance or repairs.
Key Features
- Durable AFM Composite Material: Constructed from reusable-style AFM/fiber blend, this gasket outperforms standard paper/cork alternatives with superior oil-tight sealing.
- Universal Compatibility: Designed for Harley-Davidson Big Twin primary covers across Panhead, Shovelhead, and Evo configurations (specific to primary type).
- Oil & Fluid Resistance: Engineered to withstand harsh engine fluids while maintaining structural integrity under high temperatures.
- Easy Installation: Flat gasket design simplifies replacement when servicing chain, clutch, or starter components.
Why Choose This Product
Cometic's C9308F1 gasket combines industrial-grade durability with precision engineering to prevent leaks and maintain engine performance. Its reusable design (when undamaged) reduces long-term costs, while the oil-resistant properties ensure compatibility with primary fluids. Trusted by mechanics and riders alike, this gasket delivers reliable sealing for demanding powersports applications.
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Upgrade your Harley-Davidson Big Twin's reliability with Cometic's C9308F1 Primary Cover Gasket. This advanced AFM/fiber composite gasket delivers exceptional oil resistance and durability, ensuring seamless performance for Panhead, Shovelhead, and Evo engines. Perfect for maintaining peak engine efficiency during maintenance or repairs.
Key Features
- Durable AFM Composite Material: Constructed from reusable-style AFM/fiber blend, this gasket outperforms standard paper/cork alternatives with superior oil-tight sealing.
- Universal Compatibility: Designed for Harley-Davidson Big Twin primary covers across Panhead, Shovelhead, and Evo configurations (specific to primary type).
- Oil & Fluid Resistance: Engineered to withstand harsh engine fluids while maintaining structural integrity under high temperatures.
- Easy Installation: Flat gasket design simplifies replacement when servicing chain, clutch, or starter components.
Why Choose This Product
Cometic's C9308F1 gasket combines industrial-grade durability with precision engineering to prevent leaks and maintain engine performance. Its reusable design (when undamaged) reduces long-term costs, while the oil-resistant properties ensure compatibility with primary fluids. Trusted by mechanics and riders alike, this gasket delivers reliable sealing for demanding powersports applications.| SKU | GM75FE3340 |
|---|---|
| MPN | C9308F1 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- socket and ratchet set (SAE Harley primary cover fasteners)
- Allen/hex or Torx bits as applicable to the specific primary cover
- inch‑pound or foot‑pound torque wrench (for primary cover bolts)
- gasket scraper or plastic razor blade (for old gasket removal)
- brake cleaner or dedicated gasket remover/solvent
- lint‑free rags
- drain pan for primary fluid
- rubber mallet (if cover is lightly stuck)
- service manual for torque specs and bolt pattern
Pro Tips
- Lay the new Cometic gasket on the cover or case first and confirm every bolt hole and dowel lines up before adding fluid or tightening bolts
- Dry‑fit the primary cover with two bolts finger‑tight to ensure the gasket is not pinched, then install the remaining bolts and torque in a criss‑cross pattern to factory spec
- Use a plastic scraper rather than metal on aluminum cases to avoid gouging the sealing surface
- Allow any solvent or brake cleaner to flash off completely before installing the new gasket so it seals correctly
- If the bike has known primary seepage issues, inspect the cover mating surface for warpage with a straightedge while you have it apart
Common Mistakes to Avoid
- Reusing a damaged or compressed old gasket instead of installing the new one
- Over‑tightening primary cover bolts and crushing or extruding the gasket
- Not cleaning both sealing surfaces completely before installing the new gasket
- Pinching or misaligning the gasket around the inspection/derby areas or dowel pins
- Failing to check and replace worn primary cover seals (e.g., shifter or starter seal) while the cover is off
- Using excessive RTV/silicone on the entire gasket surface instead of only at specified junction points (if any)
Comparison vs Stock/OEM
Compared to typical OEM or aftermarket paper primary gaskets, Cometic’s composite/AFM construction offers better oil sealing, resistance to cold‑flow, and improved durability under repeated heat cycles.
Improvements
- More robust, less prone to tearing during installation or removal
- Better long‑term oil‑tight seal, helping reduce primary cover seepage
- Handles repeated heat cycles and primary fluid exposure better than standard paper gaskets
- Edges and bolt‑hole reinforcement reduce crushing from fasteners when torqued correctly
Considerations
- Higher price point than basic paper gaskets
- Although often reusable if carefully removed and undamaged, for best reliability it is still recommended to replace it whenever the primary is opened
- Must be installed on clean, flat mating surfaces and torqued to factory specs to realize the sealing benefits
Durability & Warranty
Expected Lifespan
Typically lasts multiple primary services if installed correctly and surfaces are flat; many riders run the same Cometic primary gasket for several cover removals if it remains undamaged.
Warranty
Standard Cometic manufacturer warranty against defects in materials and workmanship (no wear‑out coverage; warranty terms depend on seller and region).
Maintenance
No direct maintenance; inspect for seepage around the primary cover perimeter at regular service intervals. Replace gasket any time the primary cover is removed or if leakage is observed.
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