Sign in to follow this  
Followers 0
rwebmx

chain upper roller bearing

2 posts in this topic

2013 YZ450F:  I am hoping someone can tell me why my upper chain roller keeps breaking. The rear wheel bottomed out and hit the underside of the fender for first time in 9 yrs  The sag is set to 4 inches.  I am a Motocross rider and the tracks have been a little rougher lately than usual.  The muffler is an aftermarket Yoshimura.   This is the third sub-frame on the bike and it has already been rewelded once.  Twice it has broken at the rear muffler mounting bolt and twice where the upper chain roller mounts.  Could it be the rear shock/suspension?

Edited by rwebmx

Share this post


Link to post
Share on other sites

While the rear shock is likely at fault for the bottoming, whether from need of oil, a simple servicing, a crushed bumper, or a higher rate spring to deal with either your increase in riding speed or your weight gain, You shouldn't be breaking the upper roller off unless your chain is too tight.

1 person likes this

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