BMW K bikes (Bricks)

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1Back to top Go down    cold knock on Tue Apr 07, 2015 7:32 am

k100newbie

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hi all i have the cold engine knock noise seems common probably the output shaft im guessing i should try find a 12 rivet one?

    

2Back to top Go down    Re: cold knock on Tue Apr 07, 2015 8:52 am

RicK G

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I would not be too concerned about it if it is only happening when it's cold. The engine often doesn't run smoothly till it warms up and the uneven idle will often cause the knock to be very exaggerated.
If you remove the crank cover on the right side of the engine and have a play around you can get the engine into a position so as to see the shaft and rivets then you can see what state they are in by rocking the engine in 5th gear. If it is bad then movement can be seen.
My K1100 is fairly noisy when cold and they all have the 12 rivet shaft. It can just be general engine noise till the heat get in and the clearances take up a bit.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Re: cold knock on Tue Apr 07, 2015 9:00 am

k100newbie

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Thanks for the assurance Rick, I get the impression that from reading around it always happens

    

4Back to top Go down    Re: cold knock on Tue Apr 07, 2015 9:59 am

Holister

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Hi newbie Very Happy
Just out of interest, what engine oil are you using?
Is the knock always there or does it come and go?
Cheers


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1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

5Back to top Go down    Re: cold knock on Wed Apr 08, 2015 9:08 am

k100newbie

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only there when cold havent got it registered yet dont know what oil is in it but will be changing it anyway

    

6Back to top Go down    Re: cold knock on Wed Apr 08, 2015 9:20 am

RicK G

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k100newbie wrote:Thanks for the assurance Rick, I get the impression that from reading around it always happens
It is fairly common. Many of them will rattle for all their life and some get so that they need fixing with the 12 rivet shaft. Keep an eye on it and if it does get worse over time then action needs to be taken.


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

7Back to top Go down    Re: cold knock on Wed Apr 08, 2015 10:40 am

Holister

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k100newbie wrote:only there when cold havent got it registered yet dont know what oil is in it but will be changing it anyway
Back when I first bought my old girl I happened to be speaking to a retired BMW m/c mechanic who said not to worry too much about the noise. The PO told me the oil had been done but after a few weeks I decided to change it any way. The old oil was very black and seemed thin. With the new oil (semi-synthethic) the noise very nearly disappeared. I've recently changed to full synthetic and it's a little quieter again.


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

8Back to top Go down    Re: cold knock on Thu Apr 09, 2015 11:51 pm

k100newbie

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RicK G wrote:
k100newbie wrote:Thanks for the assurance Rick, I get the impression that from reading around it always happens
It is fairly common. Many of them will rattle for all their life and some get so that they need fixing with the 12 rivet shaft. Keep an eye on it and if it does get worse over time then action needs to be taken.
cheers for that, i notice you have an sr500 ? i was looking after one for a while we had it nicknamed the clown bike Smile

    

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