Honda 400EX 400X 87mm Big Bore Kit – 416cc Top End, Hotcam, Titanium Studs

SKU 256110436424

💥 Honda 400EX 400X 87mm Big Bore Kit – 416cc Top End Rebuild
The Ultimate Big Bore Upgrade for Honda TRX400EX/400X

Unlock your Honda TRX400EX or TRX400X’s true potential with the BPRATV 87mm Big Bore Kit. With a complete top-end rebuild, this kit offers everything you need to increase your engine's performance, reliability, and power. Featuring a forged piston, Stage 2 Hotcam, and a range of high-quality components, this kit is designed to make your ATV run smoother and more powerful.

What’s Included:
⚡ BPRATV 87mm Big Bore Cylinder – Comes with a 1-year warranty for peace of mind
🏎️ Wiseco or Wössner Forged Piston – Durable and high-performance
🔥 Hi-Temp Piston Rings – Designed for high heat resistance
🔩 Chrome Wristpin – Strength and durability in one
🔧 Circlips – Ensuring secure piston placement
🛠️ Cometic Top End Gasket Kit – Leak-free and reliable sealing
🌀 Hotcams Stage 2 Camshaft – For optimized performance
🛡️ Cam Bearings – Smooth cam operation
💎 Talon Titanium Cylinder Stud Kit – Lightweight and incredibly strong
🔗 Heavy Duty Timing Chain – Ensuring precise timing
🔩 Hardened Steel Intake and Exhaust Valves – For superior performance
💪 Valve Springs and Retainers – To handle higher power
🔒 Valve Stem Seals – Prevents oil leaks and ensures longevity
⛽ Runs on Pump or Race Gas – Versatile fuel compatibility
🔧 No Case or Head Mods Required – Easy install with no modifications needed

Key Benefits 🏎️

• 416cc Power: Boosts engine capacity for improved performance

• Reliable Performance: All components are designed for durability and high heat resistance

• Stage 2 Hotcam: Optimized for better throttle response and more power

• Talon Titanium Cylinder Studs: Offers unmatched strength and weight savings

• Easy Installation: No modifications required for your case or head

Warranty:

• 6-Month Warranty: Full warranty provided if installed by a qualified mechanic

• Important: We strongly recommend professional installation by an experienced mechanic. Warranty is void if parts are not installed or tuned correctly, or if the engine is misused.

Compatibility:
✅ Fits all Honda TRX400EX (1999-2008) and Honda TRX400X (2009-2014) models