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Cam lobe pitting

Started by idordic, July 12, 2020, 01:31:06 PM

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idordic

Hi everybody,

first of all, I've got a '91 GS500E with 33k miles on the clock. I got the bike with 27k miles, and last week I decided it was time to check the valve cleareance and adjust if necessary. Ended up being 1 tight intake and the rest were fine, exhaust valves were set to the loose side as suggested by the people on the forum. Just when I thought I did everything and wanted to put it back together I realized the left intake cam lobe has some pitting on it  :icon_confused: . The pitting is just like in the picture except  it's a bit higher than what is shown on the picture. I've decided to put it back together and run it as is, as the pitting isn't on the nose of the cam(figured it wasn't that bad).
Have any of you ever experienced this with your GS' ?
Am I screwed?

Thanks.

The Buddha

Well if its smoothish to touch, use it cos it will eventually need new cams, but if it takes up oil you're OK it will be protected by the oil. It will wear against the ship, so the shim in that bucket will have to be carefully monitored, and likely tossed after its spent a few 1000 miles there. That's a idiot mechanic who did that BTW, not a manufacturing defect.

Cool.
Buddha./
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idordic

Hey Buddha, thank you for replying. The pitting isn't very deep and as I said its on the bottom of the lobe(the part that doesn't push on the shim, when they're adjusted correctly) and I might just keep on running it and check it in a thousand miles or so. The thing is that I might've even done it but don't know how. Would it be possible that it happened because my valve shim removal tool popped out a few times?  :roll:
Thanks!

The Buddha

Not likely, you try to wedge a screwdriver between the cam and shim ? That would cause it. You're right, its anyway supposed to not make contact - you should be good, it will take up oil and likely never change for the life of the bike.
Cool.
Buddha.
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idordic

Hey, no I haven't tried to stick the screwdriver in between the shim and the lobe, just used it to push the shim up, only at that notch the bucket has. Thank you for your replies, it made me feel better about the bike.  :thumb:

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