400EX 400X 89mm Hi Comp Big Bore Kit Race Gas 12.51 Piston +4 Rebuild 440cc Kit

  
NEW 89mm big bore cylinder. 89mm Wiseco 12.5:1 big bore forged piston.

Cometic big bore top end gasket kit. Piston uses pump or race gas.

Works on all Honda 400EX, 400X, and XR400R models and years. This is a bolt on kit that requires no machining of any kind. Runs on pump or race gas.

At bpracingatv our kits come with parts from the best brands in the industry. What makes our kits different is they are always more complete than our competitors'. We want you to spend as little time having to search for parts as possible. We always stock the exact same parts from different companies so that when back orders occur we have an alternate part to send that is the same quality.

This would be the ONLY reason your order might be slightly different when it arrives. We have bulk pricing available for every item we sell. Just let us know how many you need! Please check your order completely right when you receive it and let us know immediately if there is an issue so we can resolve it ASAP.

Unless otherwise stated, we stand behind the parts we sell 100%. We ALWAYS STRONGLY recommend parts be installed by a qualified, experienced mechanic.