Wiseco 85.50 mm Top End Rebuild Kit – Honda TRX400EX / TRX400X / XR400R

🛠️ Description
Rebuild your Honda 400cc motor with confidence using the Wiseco 85.50 mm Top End Kit (+0.50 mm, 10:1 compression). This complete kit includes everything you need to refresh your top end with race-proven forged piston technology, precision-fit gaskets, and premium components. Wiseco pistons are trusted by top race teams across motocross, GNCC, and Supercross, making this kit the ultimate upgrade for riders who want strength, performance, and reliability.

✅ What’s Included

• Forged 85.50 mm piston (+0.50 mm over, 10:1 compression)

• High-performance piston ring set

• Wrist pin & circlips

• Complete top-end gasket kit (head, base, valve cover, and seals)

📦 Fitment
Honda TRX400EX Sportrax

• 1999–2009

Honda TRX400X

• 2012–2014

Honda XR400R

• 1996–2004

🛡️ Warranty Info
Wiseco piston kits are covered by a limited manufacturer’s warranty against defects in materials and workmanship. Warranty does not cover race damage, improper installation, or poor tuning.

🔑 Key Features

• Forged piston construction for superior strength-to-weight ratio

• Race-proven designs used by top professional teams

• +0.50 mm oversize (85.50 mm bore) increases displacement and power

• 10:1 compression ratio for excellent performance and reliability

• Includes premium top-end gasket kit for a complete rebuild solution

• Designed for both recreational riders and racers