Honda 400EX / 400X / XR400R 87–89mm Big Bore Head Gasket | Cometic (1996-2014)
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Honda TRX400EX / TRX400X / XR400R 87mm–89mm Big Bore Head Gasket (Cometic)
🛠️ Description
Upgrade your Honda 400EX, 400X, or XR400R engine with this Cometic MLS head gasket designed for big bore applications. Whether you’re running an 86 mm stock bore or pushing up to an 89 mm big bore cylinder, this gasket delivers a precise seal and dependable performance. Built in the USA with multi-layer steel (MLS) construction, it’s a trusted solution for serious riders and builders.
✅ What’s Included
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(1) Cometic MLS 89 mm head gasket kit
📦 Fitment
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Honda Sportrax 400 TRX400EX 2x4: 1999–2008
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Honda TRX400X 2x4: 2009–2014
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Honda XR400R: 1996–2004
🛡️ Warranty Info
Manufacturer’s limited warranty against defects in material and workmanship.
🔑 Key Features
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Works with 86 mm – 89 mm bore sizes
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Multi-layer steel (MLS) for maximum sealing strength
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Engineered to handle increased compression and performance builds
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Made in the USA
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
