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1Back to top Go down   Strange clunk/knock, 85' K100RS Empty Strange clunk/knock, 85' K100RS on Sun Nov 03, 2019 3:38 pm

kjott

kjott
New member
New member
Does someone have a clue what this sound could be?

This is not the actual bike, but is has the same clunk/knock when idling (and small reving) with the revs dropping a bit.

 

    

2Back to top Go down   Strange clunk/knock, 85' K100RS Empty Re: Strange clunk/knock, 85' K100RS on Sun Nov 03, 2019 4:04 pm

charlie99

charlie99
VIP
VIP
output shaft rivet issue ?


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OStrange clunk/knock, 85' K100RS Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

3Back to top Go down   Strange clunk/knock, 85' K100RS Empty Re: Strange clunk/knock, 85' K100RS on Sun Nov 03, 2019 7:58 pm

Laitch

Laitch
Life time member
Life time member
It sounds to me like intermittent weak spark in one cylinder. That's what I'd hope anyway, if it were my moto's engine doing this. Laughing  I'd check the coil terminals and clean them, check the HT leads and clean them, check the plug terminals and clean them then compare the spark plugs to each other. Diagnosing the condition of one engine by listening to the noise made by a different engine doesn't seem like an effective strategy though.


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1995 K75 73,000 miles
Strange clunk/knock, 85' K100RS Usa-lo10
    

4Back to top Go down   Strange clunk/knock, 85' K100RS Empty Re: Strange clunk/knock, 85' K100RS on Mon Nov 04, 2019 5:03 am

Stumpy

Stumpy
Silver member
Silver member
Try using a screwdriver and put it on different parts of the engine until you find the area that the sound is loudest. That will give you a starting point.


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BMW K100RT 0095857
    

5Back to top Go down   Strange clunk/knock, 85' K100RS Empty Re: Strange clunk/knock, 85' K100RS on Mon Nov 04, 2019 9:54 am

moriarti

moriarti
Silver member
Silver member
Hi for just a few pounds/dollars you can buy a Stethoscope on ebay, one of the handiest tools to have, noise finder/carb seter ect.And you can check your heart rate to make sure your still here Strange clunk/knock, 85' K100RS 723598


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1984 k100 rs red/black VIN  0004449
    

6Back to top Go down   Strange clunk/knock, 85' K100RS Empty Re: Strange clunk/knock, 85' K100RS on Mon Nov 04, 2019 3:35 pm

kjott

kjott
New member
New member
Thanks for the reply's, but this is a bike I'm thinking about buying, so I dont have it in my garage :/

The video under is of the actual bike. Some knocking and small drop in the revs. Could a bad breather hose and bad sync make this? (I know the hose had a small leakage).



    

7Back to top Go down   Strange clunk/knock, 85' K100RS Empty Re: Strange clunk/knock, 85' K100RS on Mon Nov 04, 2019 7:19 pm

volador

volador
Silver member
Silver member
How many thousand miles/kilometers on the moto?
Has the moto sat for some time neglected?
The owner have any maintenance history?

If you see the Z shaped crankcase breather hose is cracked, inspect the intake manifold rubber stubs, plenum/air accumulator rubber bushings and throttle body protection caps if original may all be suspect of leaking

Moto probably just needs a tune up and some new rubber


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1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

8Back to top Go down   Strange clunk/knock, 85' K100RS Empty Re: Strange clunk/knock, 85' K100RS on Tue Nov 05, 2019 6:48 am

Dai

Dai
Life time member
Life time member
Sounds like leaky rubber to me, combined with the possibility of a partly-blocked injector. Nothing insurmountable, just a little time-consuming. See Volador's list.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

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