BMW K bikes (Bricks)

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duck

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On the K75 zombie I'm bringing back to life the throttle bodies won't close all of the way so it runs up the idle. If I push down on the throttle bar with my finger I can get them to close all of the way and I tried spraying some silicone lubricant on the springs but no joy.

(I know it's not the TPS because I took that off and even with that removed they still don't close all of the way.)

I do have a spare set of better K75 TBs on hand that I can swap in so if there's no easy fix then I'll have to go that route.


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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
http://www.ClassicKBikes.com
    

charlie99

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the choke cam not getting in the way of a full return to closed ?

just another place to look


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

ReneZ

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There are only a few reasons why the TB's might be kept open (to my experience). You already mentioned the TPS, then possibly wrong adjusted gas or choke cables (no play), the set screw at the front of the rack or a jubilee clip or similar on the last leg that's intervening with the "choke" cam and preventing full closure. There's nothing else as the springs on the shaft are expected to push them shut (or against the set screw). Let us know if you found it?


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Greetings from Florida! Having a 'new' K :cyclops: Surprised-o:

Rene


BMW K100 - 1985 (0030029)
BMW K1200GT - 2003 (ZK01223)
    

Inge K.

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A worm drive clamp stickin' its head out?


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

Point-Seven-five

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What happens when you disconnect the fast idle cable?

Does the engine have a fast idle light switch installed?


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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
    

duck

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Naw, I loosened both cables. (and there's slack in the cruise control cable too)

I'll check the hose clamps but it was running fine when I sold it eight years ago so I don't think that's it.

I think maybe the springs atrophied from lack of use. Laughing


__________________________________________________
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
http://www.ClassicKBikes.com
    

robmack

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Did the owner fool with the interlinkage screws in the time he/she owned it? Is the blue paint intact? Could be that one of the butterfly valves is closing up earlier than the others as a result.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

duck

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Nope. Blue paint still good. I know the PO and can't see him doing that anyhow.


__________________________________________________
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
http://www.ClassicKBikes.com
    

Dai

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Had that problem recently and fixed it by dumping a load of WD40 between the TPS and the TBs. The 'scissor' action pivot between the fast idle cable and the TBs was crudded up.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

duck

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Mystery solved. The culprit is a sticky throttle cable. I detached it and the throttle springs back to closed just like it should. Maybe the lining is worn, the cable is rusty or it's just old. I 'spose I'll get a new one. Anyhow, since it's a K75S with the TBs exposed, if it gets stuck while riding it's very easy to just reach down and push it back down with my hand.

In the meantime I'll break a Kardinal Rule and spray some silicone lubricant down the throttle cable. Silicon is pretty inert and I'll be tossing the old cable soon anyhow . . .


__________________________________________________
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
http://www.ClassicKBikes.com
    

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