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????

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 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.

Related Content


Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  57 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.