450 motor in 426

4 replies to this topic
  • chromepowder

Posted April 12, 2005 - 10:19 PM


Hey i am new to this site. I jst purchased a 2001 yz426f and the engine is toasted in it. I was wondering if a yz450f engine will fit in that bike, and if so are there any major mods i would have to do to make it work. Will the 426 carb work with the 450 engine?

  • Joe_Jet

Posted April 13, 2005 - 07:38 AM


For the price of the motor you could probably get a whole 450????

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  • grayracer513

Posted April 13, 2005 - 09:07 AM


For the price of the motor you could probably get a whole 450????

There's one on eBay right now for $1900. (or more, I don't know what the bid is on it)

Yes, it should fit, but the hard points MAY have been relocated slightly, so it might not bolt straight up. I doubt it, but I just don't know. The part numbers are different for the engine brackets, so that may be all you need.

It would still be heavier than an original YZ450, too.

  • cowboyona426

Posted April 13, 2005 - 10:45 AM


This was discussed back when the 450 first came out, and it was decided that it would not work if I remember right. I think the big issue was getting the swingarm pivot to line up right, but I can't remember for sure. It could probably be done, but it would require some cutting/welding on the frame I'm willing to bet.

  • Satch0922

Posted April 13, 2005 - 07:33 PM


Cowboy is correct.....it will not fit. You would have to modify the 426 frame and the oil lines would have to be replaced.

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