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GS750 engine noise

Congrats! I know it always feels good solving a potential motor death sentence problem.

cg
 
Ahh, but did you lean it upside down to see if it made any funny noises....?:)

Result there and another new (to the current members of this forum, or at least the ones who read this thread) problem solved. Thanks for updating.

BTW - don't ride your bike down this way tonight - it's bloody cold!
 
I may need to do the coil relay mod, and full carb dip just incase :rolleyes:. The ride was great, but traffic was busy. Heated grips on full and still 14.1 volts on meter:).
 
So in theory... Why ?


Just a wild guess:

Could the bucket be worn slightly and allow itself to rock side to side on the valve stem. When the cam lobe would push down on it and the bucket rock to the side, that would put the pressure on one side of the bucket and cause it to rotate. That rotation would push the cam to one side causing the knock...

Only fix would be replacing the buckets.
 
Some of the buckets have the little tip inside to push on the valve, some don't.

I wonder if this might have something to do with it?
 
gs750 engine noise

gs750 engine noise

Well here we go, Mekanix i think your on the right track with lateral forces on the buckets. I found 2 followers with more wear marks at top and bottom but next to nothing at the waist area, measuring with my cheap digital guage i could not see any variation in diameter. What do you folks think ?.
Tried to upload a picture but did not work, so did a video.
Dennis.
http://www.youtube.com/watch?v=0gX6pXojiSg&feature=youtu.be
 
I think the weight of the cams when tiped over would be holding them to one side so there wouldn't be any movement to cause the knocking.


In that video it looks like those buckets belonged to one cam, Exhaust maybe? And maybe they were in the right place for one to compliment the lateral movement of the other ?
 
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GS750 engine noise

Mekanix, thanks for the interest. I mixed up the followers when i put them on the bench so dont know what cam there from :confused:. I am in the re-paint mode at the moment, so have drained the carbs for the winter, the roads mostly stay wet and salty here in winter. Not the ideal conditions for an old jap bike :mad:.
 
MY GS 850 makes exactly the same noise! So replace all the cam buckets? Best source for parts?

 
This noise is extremely similar to the noise my bike makes. I will be tearing it down soon, I'm glad this topic popped back up. I will definitely check the issues listed here!

What is a good site to get the shims and buckets from?
 
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Resurrecting an old thread....my engine is making the same noise, and also suspect worn shim bucket, although, my noise is not as loud. What additional harm could I cause by running the engine? I have a 1500 mile road trip plan, and debating taking the 850 or the Harley. Want to take the 850, but if I will do additional harm, will leave it parked.
 
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