BMW K bikes (Bricks)

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1Back to top Go down   Idling problem Empty Idling problem on Wed Apr 08, 2020 3:38 pm

PiotrK100

PiotrK100
Silver member
Silver member
Hi there again
There is the movie that will show everything better that thousand words:
https://www.youtube.com/watch?v=8uWburs0V24

I have no idea what can cose that problem because linkage has a free play, nothing clogg the free movement. Looks like a spring is not closing baterfly (but all springs are ok) but how? All is ok.

I'm sure the explanation must be very simple but looks like I'm to stupid to find one. That is why must be supported lol!

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2Back to top Go down   Idling problem Empty Re: Idling problem on Wed Apr 08, 2020 4:26 pm

moriarti

moriarti
Gold member
Gold member
Make sure  the Choke/ fast idle cable is not stuck and pulling/holding the throttle open.


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

3Back to top Go down   Idling problem Empty Re: Idling problem on Wed Apr 08, 2020 4:31 pm

PiotrK100

PiotrK100
Silver member
Silver member
@moriarti wrote:Make sure  the Choke/ fast idle cable is not stuck and pulling/holding the throttle open.
Done already, a lot of free play.

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4Back to top Go down   Idling problem Empty Re: Idling problem on Wed Apr 08, 2020 4:34 pm

duck

duck
Life time member
Life time member
Things to try:

It may be the TPS holding it open.

Also lube the throttle gears in the throttle perch. (I get rid of the old grease and use spray silicone instead.)

Try adding some slack where the throttle cable leaves the throttle perch.

Make sure that the grip rubber is not rubbing against the throttle perch. (or bar end if there is one)

Spray some silicone grease in the TB springs.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

5Back to top Go down   Idling problem Empty Re: Idling problem on Wed Apr 08, 2020 4:41 pm

nino

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Life time member
Hi Piotr, few years ago you posted a engine noise  problem on this forum, but never finished. What happened, did you solve noise. How?

    

6Back to top Go down   Idling problem Empty Re: Idling problem on Wed Apr 08, 2020 5:05 pm

PiotrK100

PiotrK100
Silver member
Silver member
@duck wrote:Things to try:

It may be the TPS holding it open.

Also lube the throttle gears in the throttle perch. (I get rid of the old grease and use spray silicone instead.)

Try adding some slack where the throttle cable leaves the throttle perch.

Make sure that the grip rubber is not rubbing against the throttle perch. (or bar end if there is one)

Spray some silicone grease in the TB springs.
Will try TPS but just made adjustments and looks ok.
Believe me all linkage, places where linkage goes were several times lubricated and everything plays free. Only the throttle behaves as the spring did not close butterfly completely. I think I should looking for problem in there, but TPS also looks somehow reasonable

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7Back to top Go down   Idling problem Empty Re: Idling problem on Thu Apr 09, 2020 7:23 pm

Snod Blatter

Snod Blatter
Life time member
Life time member
@duck wrote:Things to try:

Also lube the throttle gears in the throttle perch. (I get rid of the old grease and use spray silicone instead.)

Try adding some slack where the throttle cable leaves the throttle perch.

Spray some silicone grease in the TB springs.
Came here to say make sure there really is free play in the cable, when I first got my K I couldn't figure out why I had to set the cable to have loads of slack before the revs would fall quickly down to idle and it was because the gear wheel with the chain on it was heavily worn, which adds a lot of slack to the movement.

Also, some kind of grease (or I'd start with light oil) on the TB springs is easy enough to try.

Do the revs fall back to idle speed quickly?


__________________________________________________
1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

8Back to top Go down   Idling problem Empty Re: Idling problem on Thu Apr 09, 2020 8:37 pm

MartinW

MartinW
Life time member
Life time member
Make sure the cable is not jamming in the cable channel where it attaches at the TB's.
Regards Martin.


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K75s Hybrid
    

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