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Discussion Starter #1
Hello everyone. Got a question Im hoping some of you may have previously encountered or may be able to shed some light on for me. I have an 89 k100rs with 63k on her. When i start it up cold it makes a bunch of knocking and grumbling noises until reved up above 1500 rpm or until warm up is complete. After reading numerous posts and many forums looking for an answer to this problem I decided to disassemble the bike to correct any issues that may be causing this noise. I have it apart to the block with the cam crank and chain covers off and everything on the back end including fly wheel clutch etc. In this process I am not finding anything that would be imediatley evident as the cause. I did not pull the block and look at the output shaft but I can see the gear mesh with the crank gear and there is no slack. I can see the rivets and there is no visible slack in the rivets. At a bit of a loss at this point as to what the noise might be and I hate to reassemble the bike and leave the noise after going this far. Any ideas or advise would be greatly appreciated.
 

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Discussion Starter #2
k100 noise

If you look on youtube at bmw k100 lt problem (output shaft?) when they first get into the bike from outside, that lower thumping/knocking noise that goes away when the engine is reved up is the noise I am referring to.
 

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noise

Some of the early k bikes had a sprague clutch noise that goes away with heat or revs. That being said im only trying to remember about the rivets and no. of them and not sure what needs done to correct. I also remember it can be fixed from the crank side of the engine without removing it.
 

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Discussion Starter #5
Thank you for your replies. As I have come to find on the bmw web sites. Bmw bike owners seem to be a very knowledgeable and enormously helpful group of people. You guys are no exception. Thanks again.
 
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