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
sj269

You don't have to live with loud valves. Long post

9 posts in this topic

It all started when I hastily adjusted my valves awhile ago on my "new to me" 2000 xr650r. I probably did not get TDC correct and activated the autodecompressor (my best guess at least). immediately after, I got a loud clicking or clanking noise from the front right exhaust valve audible at all rpm ranges. When I say it was loud I mean I was embarrased to ride my bike.

The bike still ran well, and was asymptomatic of any problems other than the noise. But lets face it, thats enough look at another solution.

I had since re-adjusted the valves and was sure I did it right. The noise stayed.

I am now preparing the bike for a three day trip to Death Valley, and let me tell you, I don't want anything to grenade on me in the Valley of Death. So I took the bike to a couple of friends who have been wrenching on things for many many years. As I would cycle the flywheel to find TDC we could hear the offending clanking noise and feel the hit if we put our finger on the top of the adjusting nut of the front right valve.

One friend suggested that I might have a broken inner valve spring which was causing the valve to seat weird due to just one spring doing all the work.

So the decision was made to remove to rocker cover and see what we could see. All looked well, none of us has any experience with the decompressor set up like the xrr has ,so we played with it, cycled the flywheel, probed the springs with the blades of various tools, and visually checked all components. Since all looked well we figured it was just a "quirck of the bike". The repair manual compared against the bike did'nt show anything out of the ordinary.

I put it all back together and let the rtv gasket sit overnight.

When I fired it up in the morning, the sond was gone, the bike sounded like a sewing maching (compared to the day before.) So I don't know what happened exactly, Im just saying excessivly loud valves do not have to be put up with.

Any ideas what we did to rid the bike of the loud clanking noise?

Share this post


Link to post
Share on other sites

Its hard to say since I was not there...:worthy:

Probably just jiggled and wiggled everything to perfection...something may not have been seated just right or slightly off? :busted:

Share this post


Link to post
Share on other sites

Spining the crank the wrong way.... I think you are on to something. I will confess, when I adjusted the valves for the first time, I did, briefly, spin the crank about 1/2 revolution the wrong way. I guess that could upset the decompressor mechanism and cause all kinds of havoc.

Share this post


Link to post
Share on other sites
Spining the crank the wrong way.... I think you are on to something. I will confess, when I adjusted the valves for the first time, I did, briefly, spin the crank about 1/2 revolution the wrong way. I guess that could upset the decompressor mechanism and cause all kinds of havoc.

BINGO!:busted:

Share this post


Link to post
Share on other sites

So, if that was the case, what happenes when the crank is turned the wrong way on a xrr?

Share this post


Link to post
Share on other sites
So, if that was the case, what happenes when the crank is turned the wrong way on a xrr?

embarrassing noises happen.

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