YZ400 Gearbox problem

3 replies to this topic
  • kimey46

Posted August 16, 2006 - 04:21 AM


Hi there, i currently own a 2000 yz400f and have a problem with the gearbox. 1st and 2nd gear are fine but when i try and select third it just grinds, when you go past third 4th gear seems to be fine. Just wondered if anyone else has had this problem.
thanks steve

  • rdefonce

Posted August 16, 2006 - 08:29 AM


No, never had that issue. Whatever it is, sounds like it needs a tearin' down to have a look. No doubt it will be obvious then!

You probably shouldn't ride it much, 'cause it could do more damage.

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  • 02YZ426

Posted August 16, 2006 - 01:46 PM


You likley have a bent shift fork, and need to replace 3rd gear and the mating gear which is 4th I believe. Thats a bad deal, now you have to pull the motor and split the cases :thumbsup:

  • tom nolan

Posted August 16, 2006 - 06:27 PM


I had 3rd gear go out on mine and it took out several others as well. Also some of the shrapnel hit the crank and rod. I was able to blend out the damage with a sanding disc. When i ordered replacements, i noticed that the replacement gears were shot peened for strenght. I think they realized they have a problem with 3rd gear. If you can do the work yourself, the cost is not that bad. If you go to a shop, your screwed

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