Jump to content
Sign in to follow this  

400 vs 426 bottom

Recommended Posts

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...

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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...

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×