Today I removed my valve cover to take a few measurements on the clearances between shim and lobe before I ordered replacement shims. Just wanted to see where I stood. Anyways, my very old feeler gauge would not even fit on the smallest available blade. I have no clue what that smallest was since the rust covered the numbers. Before you all holler....I'm buying a new feeler gauge along with the tappet depressor and other necessary accessories for this job. The bike has 27,000 miles on it. The previous owner says he has never checked or adjusted these clearances. This worries me. It seems there is NO clearance whatsoever between the shim and lobe.
My questions are not really on the process. I understand how to check and replace. (It seems pretty straight forward)
1. Can somebody explain why the clearances get tighter with wear? I don't understand that.
2. I plan on shooting for a .07 clearance for all. Is this OK?
3. Since this has never been done before on this bike is it likely other parts are damaged? Ways to tell? If so what other things should I be checking and replacing?
4. Will this solve the problem I have been having with my bike described below?
Problem: The bike seems to be limited to 5,000 RPM's. It will not go over that. After about 45 minutes of riding the bike seems to "overheat" and become very hesitant, intermediately at first, and then totally bogs. This symptom is worse under a bigger load such as going up a hill. The only things that allows the bike to recover is to letting the engine cool. The valve cover also seems to be leaking a bit, spraying all over the underside of the gas tank over time (most likely an old gasket issue). In this moment of "overheating" The engine also smokes and it appears I have smoke that come out of the airbox (gas recycling hose from the top of the head?)
Overheating seems to happen when I'm stop and go a lot as opposed to open road.
This bike is parked for the winter so I have plenty of time to tackle this issue.
Thanks for reading the novel, I just needed to run this by all of you GS experts.
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