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Start ShoppingCometic C9194 Evo Sportster EST Gasket Kit - MLS Head Gasket Set for Top-End Sealing
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Description
Upgrade your Evolution Sportster's engine integrity with Cometic's C9194 EST Top End Gasket Kit. This comprehensive solution delivers unmatched sealing performance for high-output engines, combining advanced materials with precision engineering to prevent leaks and maintain peak power delivery.
Key Features
- Multi-Layer Steel (MLS) Head Gaskets: 0.040" compressed thickness provides superior sealing for 3.530" bore applications
- Complete Top-End Coverage: Includes 12+ specialized gaskets and seals for full engine compartment resealing
- High-Performance Materials: MLS steel, fiber/composite, and rubber-coated components for durability under extreme conditions
- Engineered for Sportster Evolution: Specifically designed for 883/1100cc engines with reinforced head bolt patterns
- U.S. Manufacturing: Precision-crafted in America for exacting quality standards
Why Choose This Product
Cometic's C9194 kit offers a complete solution for engine resealing, eliminating the need for multiple part purchases. The MLS head gaskets provide long-term sealing reliability, while the comprehensive kit includes all necessary components for a thorough top-end rebuild. This ensures optimal engine performance, reduced maintenance costs, and extended service intervals - essential for riders demanding maximum power and reliability from their Sportster.
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Upgrade your Evolution Sportster's engine integrity with Cometic's C9194 EST Top End Gasket Kit. This comprehensive solution delivers unmatched sealing performance for high-output engines, combining advanced materials with precision engineering to prevent leaks and maintain peak power delivery.
Key Features
- Multi-Layer Steel (MLS) Head Gaskets: 0.040" compressed thickness provides superior sealing for 3.530" bore applications
- Complete Top-End Coverage: Includes 12+ specialized gaskets and seals for full engine compartment resealing
- High-Performance Materials: MLS steel, fiber/composite, and rubber-coated components for durability under extreme conditions
- Engineered for Sportster Evolution: Specifically designed for 883/1100cc engines with reinforced head bolt patterns
- U.S. Manufacturing: Precision-crafted in America for exacting quality standards
Why Choose This Product
Cometic's C9194 kit offers a complete solution for engine resealing, eliminating the need for multiple part purchases. The MLS head gaskets provide long-term sealing reliability, while the comprehensive kit includes all necessary components for a thorough top-end rebuild. This ensures optimal engine performance, reduced maintenance costs, and extended service intervals - essential for riders demanding maximum power and reliability from their Sportster.| SKU | GMAA497E30 |
|---|---|
| MPN | C9194 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | XL883 Sportster | 1988-1990 |
| Harley-Davidson | XLH883 Sportster | 1988-1990 |
| Harley-Davidson | XL1200 Sportster | 1988-1990 |
| Harley-Davidson | XLH1200 Sportster | 1988-1990 |
Frequently Asked Questions
It is a complete top-end gasket kit for Evo Sportster engines and includes MLS head gaskets, base gaskets, rocker box gaskets, exhaust gaskets, pushrod tube seals, and all major upper-engine seals required for a standard top-end refresh.
No. C9194 is listed specifically for late‑1980s to around 1990 Evolution Sportster models. Riders with later years should look up the correct Cometic part number by year, model, and displacement.
MLS head gaskets are typically installed dry unless the Harley or Cometic instructions specify otherwise. Some rocker box corners or specific joints may call for a small amount of sealant; follow the factory service manual and Cometic instructions rather than applying sealant everywhere.
No machining is required if your heads and cylinders are within factory flatness and wear specs. If you suspect warpage or heavy corrosion, have the parts inspected and machined as necessary before installing the new gaskets.
Many builders use Cometic EST kits with performance builds, but you must verify bore size, piston design, and compressed thickness to ensure proper piston‑to‑head and valve‑to‑piston clearances for your specific combo.
Installation Guide
Difficulty
Hard
Est. Time
4 hr 0 min
Tools Required
- Harley-Davidson service manual for applicable Sportster
- Complete SAE socket and wrench set
- Torque wrench (inch-lb and ft-lb)
- Allen/hex key set
- Torx bits (for rocker boxes, depending on year)
- Feeler gauges
- Razor scraper / plastic scraper
- Gasket remover/solvent
- Brake cleaner or similar degreaser
- Straightedge (to check head/cylinder warpage)
- Soft mallet
- Threadlocker (blue as specified by service manual)
Pro Tips
- Lay out old gaskets as you remove them and match each one immediately with the new piece from the kit to ensure everything is used correctly.
- Use a plastic scraper or a razor at a very shallow angle to avoid gouging aluminum mating surfaces.
- Dry-fit the head and rocker gaskets to confirm orientation and parting line locations before final assembly.
- Allow sealants (where specified by the service manual) to skin properly before final torque.
- Re-torque head bolts and re-check rocker box fasteners after initial heat cycles if recommended by your service manual.
Common Mistakes to Avoid
- Not following the factory torque sequence and torque specs for head bolts and rocker boxes
- Reusing old or damaged head bolts where replacement is recommended
- Failing to clean gasket surfaces completely (old material or sealant left behind)
- Installing MLS head gaskets dry where a specific prep is required, or using sealant where it is not recommended
- Mixing up front and rear head/base gaskets or rocker box gaskets
- Not re-adjusting pushrods/valve train after reassembly
Comparison vs Stock/OEM
Cometic EST MLS head gaskets typically offer better long-term sealing and heat resistance compared with many OEM composite Sportster gaskets, especially under higher cylinder pressures.
Improvements
- Multi-Layer Steel head gaskets for improved sealing and durability
- Better resistance to heat cycling and detonation in performance builds
- Comprehensive kit reduces the need to source individual OEM gaskets
Considerations
- Requires precise torque and clean surfaces for best results
- Not a substitute for correcting warped or damaged heads/cylinders
Durability & Warranty
Expected Lifespan
Comparable to or better than OEM when installed on flat, in-spec surfaces and torqued correctly; commonly used in performance and racing applications.
Warranty
Covered by Cometic’s standard manufacturer warranty (terms vary by region and distributor).
Maintenance
No direct maintenance; monitor for oil seepage around rocker boxes and head joints during early miles after rebuild and after hard use.
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