Wiseco 88.00 mm Big Bore 11:1 Top End Kit – Honda TRX400EX / TRX400X / XR400R

🛠️ Description
Unlock more power from your Honda 400 with the Wiseco 88.00 mm (+3.00 mm) Big Bore Top End Kit (11:1 compression). This high-performance piston kit increases displacement and compression, delivering stronger throttle response and horsepower gains. Built from aerospace-grade forgings, Wiseco pistons are trusted by top race teams worldwide. The complete kit includes everything you need for a top end rebuild with premium durability and race-proven reliability.

✅ What’s Included

• Forged 88.00 mm piston (+3.00 mm, 11:1 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 backed by a manufacturer’s limited warranty against defects in materials and workmanship. Warranty excludes race-related damage, improper tuning, or installation errors.

🔑 Key Features

• Big bore upgrade – 88.00 mm piston (+3.00 mm over stock)

• 11:1 high-compression ratio for stronger low-end and midrange power

• Forged from aerospace-grade aluminum alloy for maximum durability

• Race-proven piston design used across motocross, GNCC, and Supercross

• Premium top-end gasket kit included for a complete rebuild solution

• High-performance rings and alloy wrist pin deliver sustained power and longer service life