BMW K bikes (Bricks)

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SniperX

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Whatever it is it's gone after warm up. It's not all too mechanical either, and I just finished the entire timing component replacement so it's not that. Plus, it isn't coming from the front of the motor.


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1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

RT

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Hi Sniperx
my 85 RT sounded like that, and went smooth after warmup. I was told it was the output shaft rivets being worn. I chose to ignore it when I saw the work involved fixing it. There are a few good write ups about how to inspect them without completely taking off the right hand cover (and radiator hose).
Do a forum search on output shaft rivets.
Could be other problems as well, that's the one I know of. The experts will be along shortly to put you straight.
I have heard a few K s over here with the same symptoms.
Good luck
RT


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Suzuki V Strom 650DL 2011. Gasp, chain driven.
    

K75cster

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Rt is right about the rivets rattling on some bikes, also and equally as possible is the spring on the drive gear from crank to output or balance shaft, call it what you want.
A balance of the throttle bodies will eliminate everything else. Wear in the spring on the backlash of the crank/balancer gear can sound like a rattle in there at the back of the motor. Rivets or spring are possible as everything warms upand settles into the position it likes the noise is gone, so early days, when it rattles when warm it will start to be annoying and warrant investigation.
Do a search for thoseitems and you will come up to speed on them.
Might be odd but the odd bike has had the clutch arm touch the zorst and clank causing the owners concern till identified and reset.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

KJustin

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One other thing, if you have replaced/upgraded to the K1100 front end/floating rotors: mine rattle a little bit upon starting and during warm up. But after warm up, things run smoothly and this doesn't happen. Probably the other explanations above are more plausible (and certainly are if you don't have floating rotors), but thought I'd mention it, just in case. Took me a few minutes of lying on the ground under the running bike and listening to figure it out.


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1985 K100 Cafe Racer (formerly an RT), VIN 0051736
    

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