k100 cold start noise - K-Bikes.com - Excellence in Motion
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Old Feb 3rd, 2011, 10:42 pm Thread Starter
Join Date: Feb 2011
Location: oklahoma city, OK, USA
Posts: 3
k100 cold start noise

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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Old Feb 3rd, 2011, 11:37 pm Thread Starter
Join Date: Feb 2011
Location: oklahoma city, OK, USA
Posts: 3
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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Old Feb 4th, 2011, 11:54 am
Join Date: Dec 2005
Location: pgh, pa, usa
Posts: 69

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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Old Feb 4th, 2011, 1:36 pm
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Join Date: Jun 2009
Location: Burton, British Columbia, Canada
Posts: 1,650
Read this too, post 9

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53
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Old Feb 6th, 2011, 4:10 pm Thread Starter
Join Date: Feb 2011
Location: oklahoma city, OK, USA
Posts: 3
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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