Cam Chain?

[Phaseman]

My motor has developed a sort of rattle/faint clunking sound. Performance seems not to have deteriorated. I may have over filled the oil by 1/2 to 3/4 of a quart, could that cause it?

Also the sounds vary at low rpms on increase and decrease of throttle. Kind of sounds like my drive chain does when it gets too loose, only quieter. I was wondering if it could be the Cam chain. Does anyone have any info on properly adjusting the cam chain?

[gearhead13]

These engines have an auto-adjusting cam chain tensioner. If it isnt keeping your cam chain tensioned properly you might have to take it apart and clean it.
there is a how-to on bwringer's site:

http://www.bwringer.com/gs/camchaintens.html

[Nessism]

Clutch rattle at idle is very common on the chain drive GS1000 engines. Could the noise be that?

[Phaseman]

Clutch rattle at idle is very common on the chain drive GS1000 engines. Could the noise be that?

You know Ness, that actually did cross my mind... Would that involve new springs or something to repair?

[chef1366]

Get an APE clutch hub nut. Remove the clutch basket and check the back gears rivets and springs The springs should be snug and the rivets, well, should be there.

[hampshirehog]

Get an APE clutch hub nut. Remove the clutch basket and check the back gears rivets and springs The springs should be snug and the rivets, well, should be there.

Either that or try balancing the carbs first - makes a difference.

[tkent02]

First determine if it IS a clutch rattle, pull in the clutch while it is idling and see if the noise goes away.