Skip to content
IMPORTANT NOTICE: Due to the increase in fraudulent orders, the billing and shipping addresses must match when placing your order. We appreciate your patience and understanding.
IMPORTANT NOTICE: Due to the increase in fraudulent orders, the billing and shipping addresses must match when placing your order. We appreciate your patience and understanding.

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

by BPRATV
Save 13% Save 13%
Original price $461.99
Original price $461.99 - Original price $461.99
Original price $461.99
Current price $399.98
$399.98 - $399.98
Current price $399.98

M2033,4667M08900,12100-KCY-670, 4606M08500, C7826, 71016-4, 12191-KCY-673, 30-33750, 13011-KCY-670, 90601-KA5-000, 13103-KCY-670, 13111-KCY-670, 12251-HN1-003, 12209-KL4-005, C7825, 808894, 822278, 4040, 4606M08700, C7826, H0402027S, 4606M08800, 4667M08900, 808829, M2033, 8604DA


  • 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
  • Talon TITANIUM cylinder head stud kit - LIFETIME WARRANTY*!
  • 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***.


Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare