BMW K bikes (Bricks)

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1Back to top Go down   Throttled! Empty Throttled! Mon Oct 05, 2015 12:44 am

DaleRT

DaleRT
Silver member
Silver member
Why does my twist grip not return smoothly ? Polite words fail me !
   I would like to think this a more obscure reason why.
Throttled! 11-79511 Throttled! 11-1f716Throttled! 11-c5a11
It looks like its been in a vice. It is out-of-round by just under one Mill. 
   Something else for me to play with.   Dale

    

2Back to top Go down   Throttled! Empty Re: Throttled! Mon Oct 05, 2015 1:00 am

RicK G

RicK G
admin
admin
One thing I have had a couple of times was the flange on the rubber grip would be pushing against the switch block due to it riding up the throttle tube. I ended up gluing one of them but the other time just pulling it back along the tube till there was 2-3mm clearance solved the problem. Also on some assemblies there is a screw in throttle lock under and to the front of the housing. It's an aluminium screw with a head about 5c piece size.
Often it is just the grease is old and hard and it all needs cleaning, the cable should not be lubed as it has a teflon liner and will bind up over time if it is oiled.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

3Back to top Go down   Throttled! Empty Re: Throttled! Mon Oct 05, 2015 1:13 am

Holister

Holister
Life time member
Life time member
Also... when the cable gets old and worn it can bind and it'll be hard to wind it on as well. If after checking Rick's suggestions it's still slow to return, check the cable routing or replace the with a new cable.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Throttled! Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

4Back to top Go down   Throttled! Empty Re: Throttled! Mon Oct 05, 2015 4:33 pm

Dai

Dai
Life time member
Life time member
Check the crown and pinion teeth. They can spall and shed small chunks, then gall badly where the broken parts stick. Net result is that two or three teeth do not mesh correctly. These are the teeth that are in mesh when the throttle is holding approx 60mph/95kph. In my experience this can cause the throttle to both not open or close correctly from this point.

One of BMW's not-so-good ideas, I'm afraid, despite the longevity of the system across various models. I fitted a brand new pair after the original galled quite badly, then 15,000 miles later binned them as they were in the same state as the originals despite me looking after both the crown-and-pinion and the throttle cable.


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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
    

5Back to top Go down   Throttled! Empty Re: Throttled! Mon Oct 05, 2015 7:46 pm

Holister

Holister
Life time member
Life time member
Dale, what grease are you using?


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Throttled! Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

6Back to top Go down   Throttled! Empty Re: Throttled! Tue Oct 06, 2015 12:05 am

T3CHNO1D

T3CHNO1D
active member
active member
I have the same problem, I've traced it to the bar end weight rubbing on the grip. If I loosen the bar end, all good, tighten it, and it binds. I believe the grip had swollen over time and is now too long. Time to buy some new grips.

Without the chain and cam hooked up, does the cable return easily?

T3CNO1D


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Model        Production Date/Serial Number
K100         1985 ???? / (F0030125)
    

7Back to top Go down   Throttled! Empty Re: Throttled! Tue Oct 06, 2015 12:43 am

robmack

robmack
Life time member
Life time member
@T3CHNO1D wrote:I have the same problem, I've traced it to the bar end weight rubbing on the grip.
Bar-end weight should be adjustable. It fastens to an expanding bolt. Just loosen the screw, tap to loosen the expander and adjust the bar-end to stop rubbing against the grip rubber.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

8Back to top Go down   Throttled! Empty Re: Throttled! Tue Oct 06, 2015 4:38 am

rawdonball

rawdonball
Platinum member
Platinum member
I fitted bar end weights to the k75c - I like the look - found that even moderate tightening expands the tube enough to make the throttle bind. It means that I don't need to bother with the throttle friction screw which I would otherwise be using on all longish rides


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'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

9Back to top Go down   Throttled! Empty Re: Throttled! Tue Oct 06, 2015 8:23 am

Holister

Holister
Life time member
Life time member
My RT bars have the expanding bolt but the RS bars I've just installed have a threaded fixing inside which the bar-end weight bolts to. No adjustment. To stop it rubbing on the grip I just moved the switch block/throttle mechanism a few mm to the centre so I can screw the weight on firmly.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Throttled! Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

10Back to top Go down   Throttled! Empty Re: Throttled! Wed Oct 07, 2015 12:32 pm

T3CHNO1D

T3CHNO1D
active member
active member
Kaptain Holister wrote:My RT bars have the expanding bolt but the RS bars I've just installed have a threaded fixing inside which the bar-end weight bolts to. No adjustment. To stop it rubbing on the grip I just moved the switch block/throttle mechanism a few mm to the centre so I can screw the weight on firmly.
I've got the welded threads too, so I will try moving the switch block as well, isn't there a a pin that hold the switch block in place and from rotating?


__________________________________________________
__________________________________________________
Model        Production Date/Serial Number
K100         1985 ???? / (F0030125)
    

11Back to top Go down   Throttled! Empty Re: Throttled! Thu Oct 08, 2015 6:59 am

DaleRT

DaleRT
Silver member
Silver member
Thanks all for the areas to investigate. 
   At the present the Handlebars are disconnected from the steering-head as i'm replacing the bearings, 
      checking out the front fork stanchions & the front discs need replacing.
   "Grease" is there a specific grease to use?

    

12Back to top Go down   Throttled! Empty Re: Throttled! Thu Oct 08, 2015 8:47 am

Holister

Holister
Life time member
Life time member
@T3CHNO1D wrote:I've got the welded threads too, so I will try moving the switch block as well, isn't there a a pin that hold the switch block in place and from rotating?
Just the 4mm socket head from the front side (back of the switch block)

@DaleRT wrote:Thanks all for the areas to investigate.
  At the present the Handlebars are disconnected from the steering-head as i'm replacing the bearings,
     checking out the front fork stanchions & the front discs need replacing.
  "Grease" is there a specific grease to use?
I just use Penrite Molygrease EP for everything except splines


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Throttled! Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

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