Honda TRX 400EX 8689mm Big Bore Cometic Top End Gasket Kit C7826 + Seals

Product Overview

Designed for high-performance big bore builds, the Cometic Top End Gasket Kit (C7826) is ideal for 86mm, 87mm, 88mm, and 89mm piston setups such as 416cc, 426cc, and 440cc kits. It includes premium Viton valve stem seals and is made in the USA to the highest standardsperfect for high-compression and stroker builds.

Whats Included

• Cometic Top End Gasket Kit Part #C7826
• Big Bore MLS Head Gasket for 86mm89mm Builds &Pistons
• Viton Valve Stem Seals (4) OE Spec

Model Fitment

Honda TRX400EX (19992008)
Honda TRX400X (2009, 20122014)
Honda XR400R (19962004)

OEM Replacement

Valve Stem Seals replace OEM Part #: 12209-KL4-005

Why Youll Love It

• Perfect for Big Bore Builds: Made to fit 8689mm bore kits up to 440cc
• MLS Head Gasket: Multi-layered steel design handles high compression
• OEM Quality Seals: Viton valve stem seals sourced from top-tier Japanese suppliers
• USA Made: Built to last and handle performance demands

Frequently Asked Questions

• Q: Will this fit a 440cc kit? Yes, fits 416cc, 426cc, and 440cc kits (8689mm bore).
• Q: Do I need anything else? This is a top-end gasket kit; youll need a compatible piston and cylinder.
• Q: Are the valve stem seals high-temp rated? Yes, made from Viton for heat and wear resistance.
• Q: What is the head gasket made of? Multi-layered steel (MLS), ideal for high-compression setups.

Why Buy from ?

The Best Parts. The Best Performance. The Best Price.
Brand new, backed by manufacturer warranty and our expert support.
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Seal your big bore build rightupgrade to Cometic today!

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