Honda 400EX / 400X 88mm Big Bore Kit – Stage 2 Cam + Studs

🔥 88mm Big Bore Top End Kit – Honda TRX400EX / TRX400X / XR400R
Complete Performance Upgrade – Bolt-On Power With No Machining Needed

Looking for real power without having to open your crankcase or machine your cylinder head? This bolt-on 88mm big bore top end kit includes everything needed to increase displacement, improve valve lift, and keep your motor reliable for the long haul.

✅ Fits all years of Honda 400EX, 400X, and XR400R
✅ No case or head machining required
✅ Includes top-quality brands: Wiseco, Hotcams, Cometic, Talon, SKF, NGK

📦 What’s Included:

• 🧱 88mm Heavy Duty Cylinder

• ⚙️ 88mm Forged Piston (Wiseco or Wossner based on availability)

• 🔩 Nitrite-Coated Rings, Chrome Wristpin & Circlips

• 🏁 Hotcams Stage 2 Camshaft – Boost mid-to-top end power

• 🛠️ SKF Cam Bearings

• 🧰 Cometic Big Bore Gasket Kit

• 🧱 MLS Big Bore Head Gasket – Multi-layer steel construction

• 🔒 Talon Titanium Head Stud Kit – Lifetime Warranty*

• 🔧 Heavy-Duty Cam Chain Conversion

• 🔥 NGK Spark Plug

• 🎁 Stickers + 1-Year Warranty

⚙️ Key Features & Benefits:

• 🔧 Direct Bolt-On Installation – No machining or case boring needed

• 💥 Displacement Increase = Real HP Gains

• 🧩 Built for Reliability – All parts brand new and performance-proven

• 🛡️ Titanium Studs = Superior Sealing & Torque Retention

• ⛽ Compatible with Pump or Race Gas

📌 Fitment Compatibility:

⚠️ Warranty Notice:

• ✔️ 1-Year Warranty on the complete kit (new and used parts)

• 🚫 This is not a DIY project — professional installation is required for all warranty claims

• 🛠️ Warranty covers parts only after they are returned and inspected for manufacturer defects

📦 Shipping Time:
Ships within 3–5 business days. Tracking provided after fulfillment.

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