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
mlkdvm

XR600R engine noise

11 posts in this topic

I recently got a '91 xr600r. The previous owner had installed a new piston and I'm not sure what else. The engine starts and runs o.k., and seems to have good power. The compression, as measured by the feel of the kick starter, seems lower than that of a '93 I used have.

There is an intermittent "clicking" sound coming from high up in the engine. Sometimes I hear it 10 times a minute, and then sometimes I won't hear it for 5 or more minutes. My guesses as to the source of the noise are the decompressor or cam chain tensioner. I know trying to diagnose a sound that you have never heard is difficult, but does anyone have any ideas?

Share this post


Link to post
Share on other sites

I have a similar noise in the top end of my XR650L (33K miles). I have asked around and the concensus of opinion was that it is a worn cam chain.

Share this post


Link to post
Share on other sites

So is that the sound of impending doom? How long have you been riding yours with taht noise?

Share this post


Link to post
Share on other sites

I've ridden it probably 3 or 4 thousand miles since the noise started. It doesn't seem to have gotten any worse.

Share this post


Link to post
Share on other sites

If its a constant metallic rattle that is at its worst when the bike is first started, i'd say it'd be a worn cam chain. But if you're only hearing a clicking noise a few times a minute, and your idle speed is low, it's probably the auto decompressor kicking in. To stop this, adjust your idle speed a touch higher and it should stop. Good luck!

Mark.

Share this post


Link to post
Share on other sites

I had the same problem with my 89 xr 600r. The guy I bought if from said that the local bike dealer said that it was a cam chain...ok, so I buy it and take it to the mechanic, and he gets into it and says that the cam chain tensioner was wore out, but the noise we heard was rod chatter. I sure do hope this is not the case for you, because it is a quite expensive fix, $1400.00 worth the fix for me. Good luck.

Share this post


Link to post
Share on other sites

How on earth does it cost $1400 to replace a rod and piston? If your description is acurate, you are talking about maybe $400 in parts and a few hours to install.

MGS

Share this post


Link to post
Share on other sites
How on earth does it cost $1400 to replace a rod and piston? If your description is acurate, you are talking about maybe $400 in parts and a few hours to install.

MGS

You show me a dealer that will do that work for 400.00 parts and 2 hours labor. I will bet the oem piston and rings and rod were close to 500.00 Add in gaskets, berings, cam chain, bla bla bla and it would be easy to get to 1400.00. 2 hours? Try 8.

Share this post


Link to post
Share on other sites

$1000 easy. An XR650L and other thumpers have semi-permanent connecting rods. It's a $620 crank/rod assembly. Add $60 X 2 for bearings, $160 for piston/rings, $50 for gaskets, $60 for the cam chain. There you go.

I'm currently looking for a bolt-on conn. rod for my '88 NX650. The engine is nearly identical to the XR650L's. Let me know if you have something.

Share this post


Link to post
Share on other sites
You show me a dealer that will do that work for 400.00 parts and 2 hours labor. I will bet the oem piston and rings and rod were close to 500.00 Add in gaskets, berings, cam chain, bla bla bla and it would be easy to get to 1400.00. 2 hours? Try 8.

Well then, I am sure glad I do all my own work. If I had to go to the dealer for something like this, I could not afford the bike.

In all honesty, I thought he said it was a top end problem. In which case I would not expect the job to run more than $600-700. It took me 30 minutes to remove the head on my L this weekend and that is being very careful. A few hours only means more than one, I think a good wrench can do the job in 4. Bottom end, that is a different story. I think dealers get away with murder when they have to open up an engine.

MGS

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