400EX 400X 89mm Hi Comp Big Bore Kit Race Gas 12.5:1 Piston +4 Rebuild 440cc Kit

400EX 400X 89mm Hi Comp Big Bore Kit Race Gas 12.5:1 Piston +4 Rebuild 440cc Kit NEW 89mm big bore cylinder 89mm Wiseco 12.5:1 big bore forged piston Nitrite-coated piston rings Chrome wrist pin Circlips Cometic big bore top-end gasket kit Cometic MLS head gasket Kibblewhite head studs kit NGK spark plug HD cam chain conversion Piston uses pump or race gas Works on all Honda 400EX, 400X, and XR400R models and years 1-year warranty* This is a bolt-on kit that requires no machining of any kind.  Runs on pump or race gas.  Everything is new in the original packaging and the manufacturer's warranties apply***.