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
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

Regular price$320.00
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Shipping calculated at checkout.

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
  • 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***.

We ship next day most of the time. Modquad parts are shipped Monday-Thursday. Engine Kits are 3-5 business days.

We don't do backorder! If your items has already sold you will be notified immediately and you money refunded on the spot.

Sold items are removed daily.

If you see it on this website, it is 100% in stock unless it just sold before you clicked buy.

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Cut em Up!

Dune Goons Rider ~ Breanna
Showing her personal style and cutting the shirts up to her liking. We don't mind one bit! Cut em Up!