BMW K bikes (Bricks)

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1Back to top Go down   Weird K100 noise. 1984 Empty Weird K100 noise. 1984 Thu Nov 02, 2017 8:43 am

TheJoker

TheJoker
Silver member
Silver member
I've got a weird noise on my k100 I'm wondeing if someone can help point me in some direction on getting it sorted. Basically had a short ride today 3 miles get some brake fluid all fine. Then on the way back this noise started. I'd recently replaced the shaft so have pulled that to see if it was the problem but the shaft is still fine.

The bike will accelerate fine and go through all the gears fine however just get this horrible and worrying noise. Its my only form of transport until my other k100rs is on the road (input shaft seal failure).

Anyone able to possibly point me in any direction to get it sorted ?


__________________________________________________
My Bike List past to present so far;

Lexmoto (first bike ever to ride) , CB125 TDC 86 , CG125 89 , GN125 97 , ER5 96 , K100 RS 84

84/01 K100rs 0013627
    

2Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Thu Nov 02, 2017 9:20 am

Laitch

Laitch
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Life time member
@TheJoker wrote:The bike will accelerate fine and go through all the gears fine however just get this horrible and worrying noise.

Anyone able to possibly point me in any direction to get it sorted ?
Does this noise only occur with the clutch lever out? Does the pitch of the noise get higher when the throttle is twisted?


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1995 K75 81,000 miles
Weird K100 noise. 1984 Usa-lo10
    

3Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Thu Nov 02, 2017 10:20 am

Holister

Holister
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Life time member
Starter motor not disengaging.... sprag clutch??


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Weird K100 noise. 1984 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

4Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Thu Nov 02, 2017 10:32 am

TheJoker

TheJoker
Silver member
Silver member
@laitch noise occurs with the clutch in or out. And yes more throttle equals a louder noise.


__________________________________________________
My Bike List past to present so far;

Lexmoto (first bike ever to ride) , CB125 TDC 86 , CG125 89 , GN125 97 , ER5 96 , K100 RS 84

84/01 K100rs 0013627
    

5Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Thu Nov 02, 2017 12:21 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
I couldn't hear the noise but....

On centre stand with engine running put in gear and go up through the gears and keeps revs constant without altering the engine speed [use 'choke'] does the noise change as you change gear?:

If yes then it's in transmission somewhere after the gear you are in, ie towards final drive.

If no then its engine related or input into the gearbox, likely culprits are clutch, clutch release bearing, alternator monkey nuts, timing chain related. Test revving engine then to see it is changing with engine speed.

Pull clutch in does it change: if no then it's something rotating at engine speed, alternator monkey nuts, timing chain related.

If yes probably clutch release bearing.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 40,490 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

6Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Thu Nov 02, 2017 5:15 pm

Laitch

Laitch
Life time member
Life time member
I like an alternator bearing as the source of this. Put the tip of a screwdriver on the alternator body and  your ear to the handle. If it's one of them, you'll know it.  Smile

At least it doesn't seem to be spline failure, from your description anyway. cheers


__________________________________________________
1995 K75 81,000 miles
Weird K100 noise. 1984 Usa-lo10
    

7Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Thu Nov 02, 2017 7:41 pm

92KK 84WW Olaf

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Life time member
Life time member
From where you are pulling the alternator would be an easy call.......most likely cause too.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 40,490 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

8Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Sun Jan 28, 2018 3:17 pm

TheJoker

TheJoker
Silver member
Silver member
It's a bit late but for anyone that sees this thread in the future found the problem. The bolt was missing from the centre as you can see from the image below.

K has been fine since but is now off the road for some work.

Weird K100 noise. 1984 XFY00j9


__________________________________________________
My Bike List past to present so far;

Lexmoto (first bike ever to ride) , CB125 TDC 86 , CG125 89 , GN125 97 , ER5 96 , K100 RS 84

84/01 K100rs 0013627
    

9Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Sun Jan 28, 2018 3:47 pm

Dai

Dai
Life time member
Life time member
It's never too late to post a solution.


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1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

10Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Fri Mar 02, 2018 9:03 pm

johny brando

johny brando
active member
active member
@TheJoker wrote:It's a bit late but for anyone that sees this thread in the future found the problem. The bolt was missing from the centre as you can see from the image below.

K has been fine since but is now off the road for some work.

Weird K100 noise. 1984 XFY00j9
Aaaahhello stranger ! so I take it that missing Alternator drive bolt pulls in the sprag on the other side of that casing & that was why it was making that god awful noise as i guess it was not running secure and in the right plain. Still good you posted the find though ...well done , I'll put that in the memory bank now  . Cheers Lee

    

11Back to top Go down   Weird K100 noise. 1984 Empty Re: Weird K100 noise. 1984 Sat Mar 03, 2018 1:23 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I just took a good look at the photo and it looks like the splines are getting beat up and are a bit of a sloopy fit.  It may just be the angle of the photo, but a couple years ago I had the splines on the dog strip out when that bolt loosened up.


__________________________________________________
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
    

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