COMETIC C7140 High Performance MLS Top End Gasket Kit for 95mm Bore - Premium Valve Stem Seals & Exhaust Gasket

Description

Upgrade your engine's sealing performance with the COMETIC C7140 High Performance Top End Gasket Kit. Designed for 95mm bore engines, this premium MLS gasket set ensures optimal compression, reduces leaks, and enhances engine longevity for riders demanding top-tier reliability.

Key Features

  • Multi-Layer Steel (MLS) Head Gasket: Constructed from high-grade MLS material for superior heat resistance and sealing integrity under extreme engine conditions.
  • One-Piece MLS Exhaust Gasket: Ensures consistent sealing across the exhaust port for improved performance and reduced emissions.
  • Premium Valve Stem Seals (x8): Prevent oil leakage and maintain compression efficiency with durable, long-lasting seals.
  • Complete Kit Components: Includes head gasket, base gasket, exhaust gasket, O-ring set, and all necessary seals for a full top-end rebuild.
  • 1.0mm Head Gasket Thickness: Optimized for 95mm bore engines to balance durability and performance without excessive compression.

Why Choose This Product

Engineers and riders alike trust COMETIC for precision-engineered gasket solutions. This kit combines advanced MLS technology with premium materials to deliver unmatched sealing performance, reduce maintenance intervals, and protect your investment in high-output engines. Perfect for street and track applications where reliability and power are paramount.
SKU: GM75C41527
MPN: C7140
UPC: 191070007805
Category: Gaskets/Seals
Brand: Cometic
Stock: Only 1 left!
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Upgrade your engine's sealing performance with the COMETIC C7140 High Performance Top End Gasket Kit. Designed for 95mm bore engines, this premium MLS gasket set ensures optimal compression, reduces leaks, and enhances engine longevity for riders demanding top-tier reliability.

Key Features

  • Multi-Layer Steel (MLS) Head Gasket: Constructed from high-grade MLS material for superior heat resistance and sealing integrity under extreme engine conditions.
  • One-Piece MLS Exhaust Gasket: Ensures consistent sealing across the exhaust port for improved performance and reduced emissions.
  • Premium Valve Stem Seals (x8): Prevent oil leakage and maintain compression efficiency with durable, long-lasting seals.
  • Complete Kit Components: Includes head gasket, base gasket, exhaust gasket, O-ring set, and all necessary seals for a full top-end rebuild.
  • 1.0mm Head Gasket Thickness: Optimized for 95mm bore engines to balance durability and performance without excessive compression.

Why Choose This Product

Engineers and riders alike trust COMETIC for precision-engineered gasket solutions. This kit combines advanced MLS technology with premium materials to deliver unmatched sealing performance, reduce maintenance intervals, and protect your investment in high-output engines. Perfect for street and track applications where reliability and power are paramount.
SKU GM75C41527
MPN C7140
UPC/GTIN 191070007805
Brand Cometic
Category Gaskets/Seals
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Reviews

Make Model Years
Honda CRF450R 2019-2025
Honda CRF450RX 2019-2025
Honda CRF450RL 2021-2025

Frequently Asked Questions

Yes, designed for 95mm stock bore on 2019+ CRF450R/RX/RL models.

Yes, includes head, base, exhaust gaskets and valve stem seals for complete top-end service.

No, C7140 is for stock 95mm bore. Contact Cometic for oversized bore options.

C7140 has 1.0mm head gasket thickness; C7141 is 1.1mm for higher compression setups.

Installation Guide

Difficulty Medium
Est. Time 2 hr 0 min

Tools Required

  • torque wrench
  • socket set
  • gasket scraper
  • feel gauge
  • engine stand recommended

Pro Tips

  • Clean all surfaces with brake cleaner, follow Honda torque specs exactly, use assembly lube on valve seals

Common Mistakes to Avoid

  • Not cleaning mating surfaces thoroughly
  • Incorrect torque sequence on head bolts
  • Over-compressing MLS gasket

Comparison vs Stock/OEM

MLS construction vs OEM composite; superior sealing under high heat/pressure

Improvements

  • Better heat resistance
  • No compression loss
  • Reusability in some cases

Considerations

  • Higher cost than OEM

Durability & Warranty

Expected Lifespan Multiple race seasons with proper torque
Warranty 1 year limited manufacturer warranty
Maintenance Retorque head bolts after first heat cycle; inspect during valve checks

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