Sign in to follow this  
Followers 0
rideitlikeyastoleit98

03 YZF450 Bottom end

13 posts in this topic

Nope, the 450 cases are entirely different, and will not interchange. YZ400 cases will work, however.

Share this post


Link to post
Share on other sites

Yes, I believe that's exactly what I said. The cases are the same, but most of the internal parts are different.

Share this post


Link to post
Share on other sites

What happen with my cases was were the kickstart shaft seats into the right case the whole back of it broke out. So I'm trying to do some research to see what my options are. Do you have any other helpfull info that I may need to do this swap?

Share this post


Link to post
Share on other sites

I belive you will need the Crank assembly out of the 450 motor to keep it a 450. I was told that the rods are different lengths.

Nick

Share this post


Link to post
Share on other sites

OK, wait a second. I think I see a problem here. The way you originally asked the question, it sounded like you were trying to repair a 426.

HOWEVER, if you have an '03-'05 YZ450, that's a whole different thing. The crankcases for those years will neither fit anything else, nor can they be replaced by anything else. The are unique.

Share this post


Link to post
Share on other sites

What are the major differences of the cases for the 06-07 450's

versus the 05's. If an 05 case is cracked coul I use a 06.

thanks

Share this post


Link to post
Share on other sites
What are the major differences of the cases for the 06-07 450's

versus the 05's. If an 05 case is cracked coul I use a 06.

thanks

The '06 case is again, entirely different, and won't interchange with earlier models.

The '06 has the oil reservoir built into the engine, a different cylinder angle, different ignition layout, internal top end oiling, and a wider transmission.

Share this post


Link to post
Share on other sites
Didn't yamaha go to an aluminum frame in 06 or was it 07? I think they used different mounting points.
They did start the aluminum frame that year. The hard points are all in similar places, but may not match up. Either way, the crankcases won't interchange.

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