TRX400EX / TRX400X 87mm Big Bore Kit + Stage 2 Cam – 99+

🛠️ 87mm Big Bore Top End Kit w/ Stage 2 Cam – Honda TRX400EX / TRX400X
Fits all 1999+ Honda TRX400EX and 400X models

Upgrade your TRX400EX or TRX400X with this complete 87mm big bore kit, featuring a forged piston, Cometic gasket set, and a Hotcams Stage 2 camshaft for added mid-to-top end power. This is a bolt-on kit that requires no cylinder or head machining and is compatible with pump or race gas.

✅ Direct fit for all 1999–2014 Honda TRX400EX / TRX400X models
✅ Includes camshaft, gaskets, hardware, and install instructions
✅ All parts are brand new with manufacturer’s warranty

📦 What’s Included:

• ✔️ 87mm Aftermarket Cylinder

• ✔️ CP, JE, or Wiseco Forged Piston (based on stock availability)

• ✔️ High-Temp Piston Rings

• ✔️ DLC Chrome Wristpin + Circlips

• ✔️ Cometic Top End Gasket Kit

• ✔️ Hotcams Stage 2 Camshaft

• ✔️ Cam Bearings

• ✔️ Cylinder Head Stud Kit

• ✔️ Timing Chain

• ✔️ Installation Instructions + Stickers

🔧 Key Features:

• 🔩 Bolt-on fit – no machining needed on head or cylinder

• 🧰 Designed for easy installation and long-term reliability

• 🏁 Stage 2 cam delivers strong midrange and top-end power

• 💥 Works with pump gas or race fuel setups

• 📦 Ships with everything required for the top end rebuild

📌 Compatibility – Fits the Following Models:

• 1999–2008 Honda TRX400EX (Sportrax 400 2x4)

• 2009, 2012–2014 Honda TRX400X (2x4)

📦 Shipping Time:
Ships within 3–5 business days. Tracking provided once fulfilled.

💬 Customer Support:
Available Monday–Friday, 7 AM to 4 PM PST
24/7 live store chat available