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
Terez

decompression issues?

4 posts in this topic

My 02 XR650R has what appears to be a loose decomp lever at the engine.

The lever at the engine is sloppy with no real return spring action.

The external return spring is definitely loose.

Is there a spring inside the rocker cover?

Is there a possibility of the decomp mechanism staying open and allowing compression out during running?

How does the little bugger work in there?

The bike still seems to firm up at TDC and the release still allows you to get past it though?

Do I have to remove the lever from the engine to replace the external spring?

Share this post


Link to post
Share on other sites

sorry cant help u here but this will go to the top so hopefully someone will chime in.

Share this post


Link to post
Share on other sites

There is a spring in there. Pull off the cover. Look at pg 8-5. The spring is on the outside and a bolt on the cover needs removed to do so. Check to make sure that the rocker arms aren't sticking to anything. They probably aren't.

It is possible it is staying open. See this

and search the forums for more info. I had to remove the auto decompresser from the cam and it fixed the problem.

Share this post


Link to post
Share on other sites

I got rid of the auto decomp as well; that was half the reason for going with a Hotcam for me. Mine made a ton of noise at idle, so I finally just decided to get rid of it. The bike has sounded a lot better since then...

And there are specs for adjusting your manual decomp as well. I believe the shop manual says that your manual decomp lever should have no more than 8mm of free play at the tip of the lever. Try adjusting that and see if it helps. If not, take the valve cover off, and go from there.

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