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Mysterious Clunk - GS850

  • Thread starter Thread starter Lunchbox88
  • Start date Start date
L

Lunchbox88

Guest
Hey guys, been working on my project (http://www.thegsresources.com/_forum/showthread.php?t=172077) and a few days after putting in new clutch springs (which my or may not be relevant), there seems to be a clunking coming from inside my engine. It is usually only after it heats up. When it happening, the sound happens about every second or so and doesnt seem to be related to engine speed. I keep thinking something rotating but I cant think of anything that rotates that slow in the engine. Any suggestions on places to look or ideas would be great. Thanks.
 
If it seems to come from the upper end and tends to go away if you get the engine speed over about 1500, it's probably just "cam walk".

If that's what it is, don't worry about it. :o

.
 
Here's a useful trick - which you probably already know but anyway, what you do is, get a long thin screw driver. Now grab it in your fist backwards from the usual way and put your thumb over the end of the handle. Now press the other end of the screw driver to the engine cases then put your ear firmly against the top of your thumb. It's amazing how much you can hear of the engine's internal workings. I've located mysterious sounds like this on a few different engines.
It costs nothing and only a minute so it might be worth a try.
 
Thanks for the response guys.

Steve: I didnt think of that, I will definitely have a closer listen to the cams.

Baz666: I did kind of try this, but the best I could get was that it seemed deep in the engine. Im going to try and narrow it down this weekend, but then thing that puzzles me is that its so slow.
 
could something gotten lose or droped in the engine case when it was apart? have you tried putting load on it?
 
BTW, I noticed you've got an MZ Baghira. I've always lusted after one of those beauties. Never seen one up close. Too bad they never sold them up here in Canada. I think they're the first ever factory supermoto.

And about the mystery noise. Since you changed the clutch springs, I don't know how useful this is but I recall hearing about how too tight clutch springs were causing a 'deep thumping' in the rear cases of a friend's bike a few years ago. Maybe check the torque on the new springs?
thanks,
baz
 
Crazy_Russian said:
could something gotten lose or droped in the engine case when it was apart? have you tried putting load on it?
Click to expand...

I dont believe this can be the case. The only thing I had off of the engine was the valve cover.

baz666 said:
BTW, I noticed you've got an MZ Baghira. I've always lusted after one of those beauties. Never seen one up close. Too bad they never sold them up here in Canada. I think they're the first ever factory supermoto.

And about the mystery noise. Since you changed the clutch springs, I don't know how useful this is but I recall hearing about how too tight clutch springs were causing a 'deep thumping' in the rear cases of a friend's bike a few years ago. Maybe check the torque on the new springs?
thanks,
baz
Click to expand...

Hmm, the new springs are definitely stiffer then the ones that were in there, but I used to a torque wrench to tighten them to 8ft-lbs. I guess I can recheck them this weekend. In your friends case, did it go away or cause any major issues?

I do really enjoy the baghira. Im just finishing up stripping the plastics down to black and polishing. Heres a pic of what it looked like when I got it.

006.jpg
 
My friend says that when he retorqued the new clutch springs, he thinks two might not have been tight enough and only under load would they make any noise.


About the Baghira. It's looks great. Man, I've always lusted after one of those babies. Must be great fun in pot-hole and rut filled urban terrain. And has the Yamaha 600 or 660 thumper engine, right?
Awesome bikes.
thanks,
baz
 
Sounds to me that the dampener springs in the back of the clutch flywheel are shot. Pull the basket and see if the sprimgs in the back are loose..any wiggle what so ever is bad.
 
Last edited:
Steve said:
If it seems to come from the upper end and tends to go away if you get the engine speed over about 1500, it's probably just "cam walk".

If that's what it is, don't worry about it. :o

.
Click to expand...

Well I believe you have have called it. Sound seems to go away at anything above 1500-1600 rpms. Is it weird that it just started?
 
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