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Start ShoppingCometic C9176 Evo Sportster EST Top-End Gasket Kit – High-Performance Engine Rebuild Kit
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Description
Upgrade your Evo Sportster EST engine's reliability with Cometic's premium top-end gasket kit. Engineered for precision sealing and durability, this complete kit ensures optimal performance during rebuilds or maintenance.
Key Features
- Premium MLS and AFM Materials: Combines multi-layer steel (MLS) and aluminum foam material (AFM) for exceptional sealing and heat resistance, ideal for high-performance engines.
- Complete Top-End Coverage: Includes cylinder head, base, rocker box, intake/exhaust gaskets, and misc. seals/O-rings for a full rebuild solution.
- Engineered for Evo Sportster EST: Specifically designed to fit the Evo Sportster EST's unique top-end architecture, ensuring perfect alignment and compatibility.
- High-Durability Composite Materials: Fiber and composite components provide flexibility and resilience under extreme operating conditions.
Why Choose This Product
Cometic's C9176 kit delivers unmatched reliability for riders demanding precision in engine rebuilds. Its advanced material blend resists compression and thermal stress, reducing leaks and extending engine life. The comprehensive component set saves time and labor, while the brand's reputation for performance parts ensures compatibility with high-output engines. Perfect for enthusiasts seeking a durable, long-lasting solution for their Sportster's top-end assembly.
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Upgrade your Evo Sportster EST engine's reliability with Cometic's premium top-end gasket kit. Engineered for precision sealing and durability, this complete kit ensures optimal performance during rebuilds or maintenance.
Key Features
- Premium MLS and AFM Materials: Combines multi-layer steel (MLS) and aluminum foam material (AFM) for exceptional sealing and heat resistance, ideal for high-performance engines.
- Complete Top-End Coverage: Includes cylinder head, base, rocker box, intake/exhaust gaskets, and misc. seals/O-rings for a full rebuild solution.
- Engineered for Evo Sportster EST: Specifically designed to fit the Evo Sportster EST's unique top-end architecture, ensuring perfect alignment and compatibility.
- High-Durability Composite Materials: Fiber and composite components provide flexibility and resilience under extreme operating conditions.
Why Choose This Product
Cometic's C9176 kit delivers unmatched reliability for riders demanding precision in engine rebuilds. Its advanced material blend resists compression and thermal stress, reducing leaks and extending engine life. The comprehensive component set saves time and labor, while the brand's reputation for performance parts ensures compatibility with high-output engines. Perfect for enthusiasts seeking a durable, long-lasting solution for their Sportster's top-end assembly.| SKU | GM6208DCDA |
|---|---|
| MPN | C9176 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster (Evolution engine models) | 1986-2003 |
Frequently Asked Questions
It is an Evo Sportster EST top-end gasket kit, but exact year/displacement coverage (883/1100/1200) should be confirmed against the latest Cometic catalog or the retailer’s fitment checker using your bike’s year, model, and engine size.
Yes, Cometic Evo Sportster top-end kits like C9176 are designed to include head gaskets, base gaskets, and associated top-end seals, but you should verify contents in the specific product listing or Cometic catalog.
Many Cometic gaskets are engineered to be installed dry. Only use sealant where Harley-Davidson or Cometic explicitly specify it in the service instructions or gasket notes.
Most Evo Sportster top-end services can be done with the engine in the frame, but clearance can be tight. Follow the factory service manual procedures for your model.
Cometic gaskets are widely used in performance applications. For high-compression builds, verify the specific compressed thickness and material of the C9176 head gaskets in the Cometic catalog to ensure proper compression ratio and piston-to-head clearance.
Installation Guide
Difficulty
Hard
Est. Time
4 hr 0 min
Tools Required
- Complete SAE socket and wrench set
- Torque wrench (inch-lb and ft-lb range)
- Allen/hex key set
- Torx bits (for certain HD fasteners)
- Feeler gauges (if service involves valve/lifter checks)
- Gasket scraper or plastic razor scraper
- Brake cleaner or dedicated gasket surface cleaner
- Straightedge for basic warpage check
- Shop manual for correct torque specs and sequence
Pro Tips
- Always use the Harley-Davidson service manual for your exact year/model when torquing heads and rocker boxes
- Dry-fit each gasket first to verify orientation and hole alignment, especially around oil passages
- Clean all mating surfaces with a non-residue cleaner and use a lint-free cloth
- Chase threads in the cylinders/heads and lightly oil head bolt threads and under-head seating surfaces if the manual allows
- After initial heat cycles, re-check for oil leaks around rocker boxes and base gaskets
- Measure head and cylinder flatness if the engine had prior overheating issues
Common Mistakes to Avoid
- Not following the factory torque sequence for heads and rocker boxes
- Reusing old head or base bolts that are stretched or damaged
- Leaving old gasket material on the mating surfaces
- Using RTV/silicone where it is not specified (many Cometic gaskets are designed to be installed dry)
- Installing gaskets backward or misaligning oil passages
- Not checking cylinder head and cylinder deck surfaces for warpage
Comparison vs Stock/OEM
Cometic gaskets are aftermarket performance-oriented parts often chosen over OEM for better sealing under high load and heat.
Improvements
- Performance gasket materials (e.g., MLS and AFM) typically offer improved sealing for performance or high-compression engines compared with many OEM paper-style gaskets.
- Better resistance to heat cycling and detonation in modified engines.
- Commonly used in racing and performance Harley builds.
Considerations
- Always confirm compressed thickness if you are trying to match OEM gasket stack height for compression ratio and pushrod geometry.
- Improper surface prep or torque procedure can negate the benefits of higher-quality gaskets.
Durability & Warranty
Expected Lifespan
Comparable to or better than OEM when installed on properly machined surfaces and torqued to spec; often chosen for long-term reliability in performance builds.
Warranty
Standard Cometic manufacturer warranty terms (details vary by region and seller; check with the retailer or Cometic).
Maintenance
No recurring maintenance on the gaskets themselves; periodically check for oil seepage around heads, rocker boxes, and base gaskets during routine service intervals.
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