BMW K bikes (Bricks)

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1Back to top Go down   Valve Tapping Empty Valve Tapping on Sun Apr 21, 2019 8:45 pm

KurtHeide

KurtHeide
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A little help with valve noise. I have a 91 16 valve k100rs. I bought the bike with 4000 miles on the clock, After rebuilding the brake system and fuel lines I put another 8000 on the bike over the past two years Just took it on a 800 mile ride. Checked the oil level and topped off before the trip and when returning home noticed that the engine valve train sounded a lot louder than usual. Upon checking the oil window, I noticed it was very low. It took 1/2 quart of oil and the sight glass line was close to the top max fill line. The bike does not smoke and runs strong but now there is a noticeable valve tick in one of the cylinders. Sounds like a stuck lifter, but knowing this is overhead cam, I'm not sure how to proceed.. Any Advice on how to proceed from here? I'd like to fix it myself if possible. I uploaded a short video. https://youtu.be/OZeZn5chXdk. Afreind said to use engine flush to clean everything out. 

    

2Back to top Go down   Valve Tapping Empty Re: Valve Tapping on Sun Apr 21, 2019 10:13 pm

Point-Seven-five

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First thing I would do is remove the valve cover to check the valve clearances and the shims to see if one of them has slipped out of it's bucket. 

If everything looks good there, the next is to check the cam chain tension and the timing of the cams.  A loose chain could possibly allow the chain to slip on the cam sprockets and alter the timing. 

As far as oil consumption, I would suspect a stuck oil control ring on one or more cylinders.  A bike with 4,000 miles in 25 years is a good candidate for gummy internal parts.   I had a problem with stuck oil control rings on my 16 valve K100RS, and running a half quart of Marvel Mystery Oil in the crankcase greatly reduced oil usage after a couple hours of run time over a five month winter storage.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   Valve Tapping Empty Re: Valve Tapping on Mon Apr 22, 2019 9:08 am

mike d

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Have you checked the exhaust headers for leaking, sounds a bit like that.

Mike

    

4Back to top Go down   Valve Tapping Empty Valve Tapping response on Mon Apr 22, 2019 10:50 am

KurtHeide

KurtHeide
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Thanks for the feedback.   Definitely not the exhaust headers and I'll check the shims and timing chain.  I was advised by several people to run Marvel through the bike but hadn't done that with a motorcycle engine before. So I'll drain out some of the oil and replace it with Marvel after I check the shims and chain tensioner.

    

5Back to top Go down   Valve Tapping Empty Re: Valve Tapping on Tue Apr 23, 2019 1:07 am

AL-58

AL-58
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Its a 16v, the shim cant slip out of the bucket.  The bucket is the shim, they come in different thicknesses.  Still check the clearances, at least you know where you are that way.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

Valve Tapping K-dogs10
    

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