BMW K bikes (Bricks)

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1Back to top Go down    Loud bang first gear on Sun Mar 12, 2017 7:32 pm

nino


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Hi, I never noticed it before and its new for me. Gearbox on my 180 th km was always very quiet but at now developed a noisy first gear engagement and sometimes from first to second. It doesnt happen every time, just sometimes. Symptom of something? Where to look. I have a new original clutch cable

    

2Back to top Go down    Re: Loud bang first gear on Sun Mar 12, 2017 8:01 pm

Point-Seven-five

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How long since the clutch splines were lubed?


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down    Re: Loud bang first gear on Sun Mar 12, 2017 8:09 pm

nino


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Not shure, but i think before 5 - 6 years 145 tkm - now 180 tkm

    

4Back to top Go down    Re: Loud bang first gear on Sun Mar 12, 2017 8:25 pm

Point-Seven-five

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Did the noise start after you installed the new clutch cable? It sounds like you clutch may be dragging a bit. Possibly cable adjustment or dry splines.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down    Re: Loud bang first gear on Sun Mar 12, 2017 8:32 pm

nino


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not related to new cable. I noticed it earlier

    

6Back to top Go down    Re: Loud bang first gear on Sun Mar 12, 2017 8:41 pm

Point-Seven-five

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Right now it looks to me like the cheapest option is to do a clutch spline lube. Maybe put some molybdenum powder in the transmission oil.

Doing that helped my bikes.

Lets see what some other opinions are.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

7Back to top Go down    Re: Loud bang first gear on Mon Mar 13, 2017 11:49 am

Laitch

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Point-Seven-five wrote:Right now it looks to me like the cheapest option is to do a clutch spline lube. Maybe put some molybdenum powder in the transmission oil.
That will help shifting, for certain.

When did you last measure the level of oil in the gearbox and when did you last change it.


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1995 K75T 60,000 miles
    

8Back to top Go down    Re: Loud bang first gear on Mon Mar 13, 2017 12:31 pm

nino


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Six months ago but rubber boot on clutch arm leaks a bit. Possible culprit?

    

9Back to top Go down    Re: Loud bang first gear on Mon Mar 13, 2017 2:38 pm

Laitch

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nino wrote:. . . but rubber boot on clutch arm leaks a bit. Possible culprit?
No, but you should plan on repairing it anyway just to prevent dirt and water contamination in there, which is one of the reasons for having the boot. Measure your fluid again and consider .75's suggestion of molybdenum powder.

Is the noise a BANG or a Klunk? Is it stubborn to downshift? Didyoulube the input splines, or did somebody else? 35k miles is a reasonable interval to do them again.

The u-joint in the driveshaft might be starting to fail. It can be inspected during the disassembly for the spline lube, whenever that happens.


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1995 K75T 60,000 miles
    

10Back to top Go down    Re: Loud bang first gear on Mon Mar 13, 2017 4:17 pm

nino


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Like a klunk. I hope not the U joint. Anyhow I have to dissasemble rear end to repair gearswitch at gearbox.
Problems with switch (maybe U joint) started with washing in public garage with pressurized gun
Thanks

    

11Back to top Go down    Re: Loud bang first gear on Mon Mar 13, 2017 8:54 pm

RicK G

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Second to first in a downshift is the first place you will notice dry splines on a K. As for the GPI switch just let it dry out in the sun and clean it with alcohol then pick away all the crumbling hard rubber and I then use a polyurethane glue like "SIKAFLEX" and coat it with that let it cure for a few days and no more problems. If you need to get it apart again a razor will cut the glue. Once you have the old rubber off you can pull them apart to clean it but it's got lots of tiny springs that hide in corners.


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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
    

12Back to top Go down    Re: Loud bang first gear on Tue Mar 14, 2017 2:48 pm

sidecar paul

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..............adding 3 resistors works wonders. idea2

http://www.k100-forum.com/t6936-gear-position-switch

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
....No CARS never ever!
    

13Back to top Go down    Re: Loud bang first gear on Tue Mar 14, 2017 6:44 pm

nino


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Thanks all. About the clutch bang: Problem solved after properly ajusted cluthch cable.

Gear indicator: I ll try Sidecar Paul simple resistor solution

    

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