400 vs 426 bottom

3 replies to this topic
  • ShmUDE

Posted December 04, 2006 - 03:40 PM


Is it possible to bolt up a 426 jug to a 400 bottom end and have a 426? Or is this just not possible. Im doing a rebuild and have an extra 426 jug and it got me thinking...

  • Birdy426

Posted December 04, 2006 - 04:13 PM


Need a 426 crank...or at least connecting rod. The small end bearing is bigger on the 426.

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

Posted December 05, 2006 - 03:12 PM


I just did this conversion, I think there was some decent info in my thread if you can find it...Birdy is right though, need a 426 crank assembly or con rod...depending on what parts you're getting from where, you may need other things too...

  • Oasis_Flame

Posted December 06, 2006 - 01:10 PM


I did just that. My bottom is WR400 with a YZ426 jug, Wiseco 13.5 to 1, 95mm piston and around 4000 miles on the motor now. Still runs new.


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.