Honda 400EX & 400X
Honda TRX 400EX & 400X 87mm 416cc Big Bore Motor Rebuild Kit

Part #: (3P-416-RK)
Starting from $779.99

CHECK IT OUT!  This ALL NEW 400EX big bore engine rebuild kit is what you need. 

Fits Honda 400EX & 400X Years 1999-2015

Kit includes:

  • NEW 87mm Cylinder
  • 87mm CUSTOM piston kit (select brand at checkout)
  • Hotrods heavy duty crank with rod
  • Hotrods heavy duty main bearings
  • Complete gasket set

This kit fits all years and models.  It is bolt on, requires no machining, and will work with your stock or modified head.  The piston uses pump or race gas.  All original manufacturers’ warranties apply.



Price: $779.99

FREE STANDARD SHIPPING is available in all US lower 48 states, APO addresses, and Puerto Rico via USPS or UPS. (*Exceptions apply for Alaska and Hawaii.)
Free standard shipping means we will select an option that gets you your parts as soon as possible while still being economically priced.

*Shipments to Alaska and Hawaii are free as long as the parts will fit in a USPS Priority Mail Flat Rate box or envelope.
For any other type of shipping there will be a charge.


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