Sign in to follow this  
Followers 0
pdrides

Really loud THUNK

5 posts in this topic

My bike is a '99 wr400 and has been running great. The last couple rides I've been hearing and feeling a really loud thunk. It sounds just like a large rock hitting my skid plate. As a matter of fact thats what I thought it was. What clued me in was that it only seems to happen on a hard landing or harsh bump. It's very random and has only happened a couple times but I want to catch the problem before it gets worse. On quick inspection the only thing I'm seeing is a slightly loose chain but not excessivly so. Anyone have any thoughts? Thanks

Share this post


Link to post
Share on other sites
My bike is a '99 wr400 and has been running great. The last couple rides I've been hearing and feeling a really loud thunk. It sounds just like a large rock hitting my skid plate. As a matter of fact thats what I thought it was. What clued me in was that it only seems to happen on a hard landing or harsh bump. It's very random and has only happened a couple times but I want to catch the problem before it gets worse. On quick inspection the only thing I'm seeing is a slightly loose chain but not excessivly so. Anyone have any thoughts? Thanks

We are going to need more info to help, I think.

Put the bike up on a stand and inspect the steering head, forks, front and rear caliper retainers, swingarm and linkage, and the top bushing for the shock.

Maybe you have loose motor mounts?

Share this post


Link to post
Share on other sites

Could it be that the front forks are bottoming out on a compression stroke ?

Are they or have they been leaking ?

Share this post


Link to post
Share on other sites

I'll get it up on a stand and check everything suggested. I tend to think it's not coming from up front, I replaced the fork seals and steering head bearings at the begining of the season and everything seems to be operating fine on that end. I can actually feel the"thunk" telegraph through my feet when it does happen...linkage does sound like a likely suspect. I'll get back. thx

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