Honda 400EX 400X 89mm Big Bore Kit Valves Springs Stage 2 Hotcam +4 440c Top End
Honda 400EX 400X 89mm Big Bore Kit Valves Springs Stage 2 Hotcam +4 440c Top End
Honda 400EX 400X 89mm Big Bore Kit Valves Springs Stage 2 Hotcam +4 440c Top End
Honda 400EX 400X 89mm Big Bore Kit Valves Springs Stage 2 Hotcam +4 440c Top End

Honda 400EX 400X 89mm Big Bore Kit Valves Springs Stage 2 Hotcam +4 440c Top End

Regular price$904.00
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Shipping calculated at checkout.

  • 89mm cylinder
  • 89mm Wiseco or Wossner forged piston
  • Hi temp piston rings
  • Chrome wristpin
  • Circlips
  • Cometic top end gasket kit
  • Hotcams Stage 2 Camshaft
  • Cam bearings
  • Talon TITANIUMN cylinder stud kit
  • HD timing chain
  • Hardened steel intake and exhaust valves
  • Valve springs and retainers
  • Valve stem seals
  • Stickers
  • Runs on pump or race gas
  • No case or head mods required
  • 6 month warranty*

 Returns: Please check your order completely when you receive it and contact us if there is an issue.  99% of problems can be easily solved without returning the entire order.  We accept returns within the first 30 days.  If you are returning an order because buyer “Changed Mind” it is subject to a 10% restocking fee plus a deduction for our cost shipping the order to you.  Orders must be sent back 100% complete and all parts must be brand new, never installed, in the original packaging to receive a refund for them.  Once items have been modified, installed, or used in any way they are not eligible for return.  It is the buyer’s responsibility to ensure returned parts arrive to us in the same condition they were when they left our facility.  For more info about returns see the Return Policy. 

 *Warranty: We stand behind all parts we sell 100%.  Everything we sell has been tested hundreds if not thousands of times and when installed and tuned correctly they work over 99% of the time.  Part failures happen, but it is rare that it is not due to being installed incorrectly.  If after installation there is an issue contact us for a warranty return.  This product is NOT DIY.  Over 99% of people in the world are not qualified to build an engine, and it is the responsibility of the person assembling and tuning the engine to make sure everything works correctly.  It requires special tools and has to be done 100% correct.  Many parts must be measured down to .01”.  We ALWAYS STRONGLY recommend parts be installed by a qualified, experienced mechanic.  Warranty does not cover failure that is a result of improper installation, tuning, break in, or misuse.   STUD WARRANTY: If for any reason a stud fails during use, not installation, we will send a completely new stud kit.  No other parts or any labor are included, and it can not be converted to a refund or discount on any order.  Studs must be returned to us for inspection first.  ALPHA CUB WARRANTY: If your Alpha Cub cylinder fails for any reason not related to installation, tuning, break in, or misuse we will fix the cylinder free of charge.  If it can not be fixed we will supply you with a new one.

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.

If you call we answer, if you text we respond, if you have a question we respond. Sometimes we sleep so it could be next morning but we will respond.

Thank you for shopping with us! We appreciate you!

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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!