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BPRATV will be closed on December 24th and 25th in observance of the Christmas holiday. We will have very limited operations from December 27th to December 31st for our annual cycle counts. Thank you for your patience and understanding. Additionally, we will be closed on January 1, 2025, for New Year's Day.
BPRATV will be closed on December 24th and 25th in observance of the Christmas holiday. We will have very limited operations from December 27th to December 31st for our annual cycle counts. Thank you for your patience and understanding. Additionally, we will be closed on January 1, 2025, for New Year's Day.

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***.


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