HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
ShmUDE

400 vs 426 bottom

4 posts in this topic

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

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0