01 wr 426f no balls

3 replies to this topic
  • brl01426

Posted September 07, 2010 - 02:11 PM


Hey I have an 01 WR426, and its slowley gotten less powerful to the point now where it has wayy less power. Its been converted to a "YZ" all plastics, seat and tank and what not, but also the muffler, the cam timing and i beleive thats it. I rode a yz426 from the same year and it was much more powerful, the only difference between them now as far as i know, is the flywheel which apparently makes a considerable difference. Is it an easy swap? Is there anything else i need to know to make it a full conversion, and also what would be making it lose power so bad? I will appreciate any input I can get from you guys, as I am about 270lbs haha, and need all the power i can get outa this thing.

  • GCannon

Posted September 07, 2010 - 02:14 PM


Clean the Carburetor and air filter, adjust the valves, clean the screen in the muffler. then let us know how its doing.

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  • brl01426

Posted September 07, 2010 - 02:34 PM


Ok thanks, whats involved in checking the valves? Im pretty mechanically inclined bikes and most things, ive just been away from it for a while.

  • wroom

Posted September 07, 2010 - 06:27 PM


brl01426... This is a 98 WR400F..

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