Jump to content

Need help identifying year bottom end

Recommended Posts

I am hoping someone can help point me in the direction to identifying what bottom end I have.  I'm not sure what year bike this engine I have is out of. I was told it was a yz400f. But It DOES have a 426 jug on it (cast into the side of it 426cc). It also DOES have stainless steel valves, they are quite heavy.   Is there any sure fire way of telling if it is a 400 or 426 bottom end? Wrist pin diameter perhaps? Con rod part number? 

Share this post


Link to post
Share on other sites

the earlier 400 & 426 cylinders were interchangeable - they share the same crankcases

whats the engine number ?

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:


×