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Start ShoppingCOMETIC C9177 Evo Sportster EST MLS Gasket Kit - High-Performance Head & Base Gaskets
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Description
Upgrade your Evo Sportster EST engine's reliability with Cometic's C9177 MLS gasket kit. Engineered for high-performance powerplants, this complete gasket set combines multi-layer steel (MLS) head gaskets with composite base gaskets to deliver unmatched sealing, heat resistance, and long-term durability.
Key Features
- Multi-Layer Steel (MLS) Head Gasket: Provides superior sealing and heat resistance for long-lasting performance in high-output engines.
- Composite Base Gaskets: Offers excellent oil and coolant sealing while maintaining flexibility for precise engine fitment.
- Complete Top-End & Bottom-End Set: Includes all necessary gaskets for full engine rebuilds, saving time and ensuring compatibility.
- 3.875" Bore Compatibility: Precision-engineered for 98.5mm bore sizes to fit standard Evo Sportster EST engines.
Why Choose This Product
Cometic's C9177 kit is trusted by mechanics and riders worldwide for its ability to handle extreme temperatures and pressures. The MLS construction prevents warping and leaks, while the composite base gaskets provide smooth sealing surfaces. This complete kit eliminates the need for multiple purchases, ensuring a perfect fit for your engine rebuild. Ideal for performance enthusiasts seeking reliable, long-lasting results without compromising power or efficiency.
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Upgrade your Evo Sportster EST engine's reliability with Cometic's C9177 MLS gasket kit. Engineered for high-performance powerplants, this complete gasket set combines multi-layer steel (MLS) head gaskets with composite base gaskets to deliver unmatched sealing, heat resistance, and long-term durability.
Key Features
- Multi-Layer Steel (MLS) Head Gasket: Provides superior sealing and heat resistance for long-lasting performance in high-output engines.
- Composite Base Gaskets: Offers excellent oil and coolant sealing while maintaining flexibility for precise engine fitment.
- Complete Top-End & Bottom-End Set: Includes all necessary gaskets for full engine rebuilds, saving time and ensuring compatibility.
- 3.875" Bore Compatibility: Precision-engineered for 98.5mm bore sizes to fit standard Evo Sportster EST engines.
Why Choose This Product
Cometic's C9177 kit is trusted by mechanics and riders worldwide for its ability to handle extreme temperatures and pressures. The MLS construction prevents warping and leaks, while the composite base gaskets provide smooth sealing surfaces. This complete kit eliminates the need for multiple purchases, ensuring a perfect fit for your engine rebuild. Ideal for performance enthusiasts seeking reliable, long-lasting results without compromising power or efficiency.| SKU | GM4A64B6A7 |
|---|---|
| MPN | C9177 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster Evolution (XL883, XL1100, XL1200) | 1986-2003 |
Frequently Asked Questions
Yes, C9177 fits all Evolution Sportsters 1986-2003 including XL1200 models.
This kit includes a multi-layer steel (MLS) head gasket which is superior to stock composite gaskets.
Only if you're reusing pistons. New pistons typically don't require honing with Cometic kits.
Standard 0.040" compressed thickness. Cometic offers other thicknesses if needed for your build.
Installation Guide
Difficulty
Medium
Est. Time
3 hr 0 min
Tools Required
- torque wrench
- socket set
- feeler gauges
- gasket scraper
- engine stand (recommended)
Pro Tips
- Use assembly lube on bearings/cams
- Follow Harley torque specs exactly
- Check piston-to-valve clearance after install
Common Mistakes to Avoid
- Not cleaning surfaces thoroughly
- Incorrect torque sequence
- Over-torquing MLS head gasket
Comparison vs Stock/OEM
MLS head gasket vs stock paper composite; much more durable and heat resistant
Improvements
- Superior sealing under high heat/pressure
- Resists blowouts common with stock gaskets
- Better for performance builds
Considerations
- Requires precise torque specs
- More expensive than OEM
Durability & Warranty
Expected Lifespan
Engine life (5-10+ years typical)
Warranty
1 year Cometic manufacturer defect warranty
Maintenance
Inspect during regular engine service; replace only during rebuilds
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