TRX400EX / TRX400X 89mm Big Bore Top End Kit – Wiseco Piston

SKU 255051901468

🔥 Honda TRX400EX / TRX400X 89mm Big Bore Top End Kit – Wiseco Piston | Fits All Years
Bolt-On Upgrade with Cylinder, Gasket Kit, Studs & Timing Chain

✅ What’s Included:

• Brand new 89mm big bore cylinder

• Wiseco forged piston – performance and reliability

• High-temp piston rings

• Chrome wristpin

• Circlips

• Heavy-duty head stud kit

• Complete top end gasket kit

• Timing chain

⚙️ Key Features & Benefits:

• 🏁 Bolt-On Power Upgrade: No machining required – install and go!

• 💥 Wiseco Forged Piston: High-performance forged design built for power and longevity

• 🛠️ Stud Kit Included: Prevents head lifting and improves overall durability

• 🔥 High-Temp Rings: Better sealing and less blow-by at high RPMs

• ⛽ Pump or Race Gas Compatible – run what you’ve got

• 📦 Everything Included: All new parts, sealed in original packaging

• ✅ Works with stock or aftermarket bottom ends

📌 Compatibility – Fits All Years & Submodels:

Fits ALL Honda TRX400EX & TRX400X models including:

• 1999–2008 Honda Sportrax 400 TRX400EX 2x4

• 2009, 2012–2014 Honda TRX400X 2x4

⚠️ Installation & Warranty Info:
This is NOT a DIY kit for beginners. A professional mechanic should install and properly gap rings, verify tolerances, and break in the engine correctly.
Improper installation is the #1 cause of failure. Warranty covers defects only after inspection – no exceptions.