BMW K bikes (Bricks)

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1Back to top Go down   92 k75 needs some expertise on an issue Empty 92 k75 needs some expertise on an issue on Mon Aug 19, 2013 9:43 pm

MikeisonTV

MikeisonTV
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So my 92 K75 is doing some strangeness!!! Sometimes in 1st gear/ neutral, the RPMs will fly way up like the throttle is wide open even in the "down" position. I look at the fine tuning adjustment screw where the throttle cable meets the engine and its down....if I push down on it during the peak of the throttle gain, it seems to move down just a few mm and in 5 sec or so usual to a normal Idle.

 It also will choke out when downshifting with no throttle as I'm slowing to stop every now and then. If I hold the throttle open with the clutch in....I can cheat it from choking out. But, obviously not ideal for long term....thoughts?

I have changed the throttle cable out and it could be the original. Doesn't seem to be sticking and returns to the bottom pretty easily.


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Yep! I'm flipping through the air....that ain't good.
    

charlie99

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pretty weird behaviour

is it a motronic type computer ...or the standard for the older type ...jetronic ?

you may have to delve into the chain /cam drive in the throttle bar-cable  assembly ...and clean it up ...at a guess ....are you sure its not fitted with a throttle stop type screw that holds the movement of the grip somewhat ?

 a pic or two would certainly help in the diagnosis and repair


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O92 k75 needs some expertise on an issue Au-log10

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

RicK G

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Sounds to me a bit like a very lean situation occuring, see ing as it appears to be on all 3 cylinders have a look around and try spraying some carby cleaner and see if the revs change which means the flamable liquid is getting in through the leak.
All the K75 have L Jetronic and so the Mass Air Flow sensor or Barn door type which are sensetive to leaks.


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"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

MikeisonTV

MikeisonTV
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It's the L Jetronic like Rick said...I removed the cruise control screw underneath the throttle grip when I put the clubman bars on. I will return it just in case. My original post I mistyped say I have changed the throttle cable, but I Havent.

I put a lot of grease to lube up the chain at the end of the cable when switch the bars. Also the choke lever is completely unresponsive when moved through the positions. 

I will make a video ASAP so it's easily seen and heard


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Yep! I'm flipping through the air....that ain't good.
    

charlie99

charlie99
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hmmm this sounds interesting


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O92 k75 needs some expertise on an issue Au-log10

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

MikeP

MikeP
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If you haven't changed the throttle cable, then that's what I'd do before anything else.

    

the.postman

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@MikeisonTV wrote:.

I put a lot of grease to lube up the chain at the end of the cable when switch the bars.
Be sparing with the grease here. Give this whole area a good cleaning out first then just a light film of grease


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1985 K100 RS   104EA49840092        #0081788     SILVERish (Madison) Prod. date 05/12/84
1984 srx 600
1986 cbr1000f/h
    

RicK G

RicK G
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One thing it may pay to double checkis that the bevel gears in the handpiece are matched up correctly, I recall having to redo my K100 after I put it together one tooth out and it didnt return properly.
When you put it like this it sounds a bit crazy to a non BMW person.
Have you checked the timing of the throttle grip gears. I can just see it now the Jap bike guys walking away saying those things are too wierd for words.


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

the.postman

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@RicK G wrote:
When you put it like this it sounds a bit crazy to a non BMW person.
Have you checked the timing of the throttle grip gears. I can just see it now the Jap bike guys walking away saying those things are too wierd for words.
And greased the chain..


But its a Shafty????? you hear them say

Yep, sounds about right


__________________________________________________
1985 K100 RS   104EA49840092        #0081788     SILVERish (Madison) Prod. date 05/12/84
1984 srx 600
1986 cbr1000f/h
    

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