BMW K bikes (Bricks)

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Fentible

Fentible
Silver member
Silver member
When I fitted the K1100 TB's to my K100 there obviously wasn't one of these vacuum switches fitted. As the switch that was already fitted to my original TB's was so badly corroded I simply taped the electrical connections up and out of the way and didn't refit it.

I recently acquired an original set of K100 33mm TB's and which had a brand new Vacuum switch attached. Out of curiosity I fitted it onto my bike. It immediately lowered the tick-over by about 50rpms and it might be my imagination but throttle response below 3000RPM seems a little more sluggish. I know it was removed from later models. What was its intended purpose??

Cheers

Fent

    

charlie99

charlie99
VIP
VIP
probably just some pollution control bs

they were frantic to tick all the right boxes to get tuv approval and global acceptance


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OPurpose of Vacuum switch on rear of throttle bodies Au-log10

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

Dai

Dai
Life time member
Life time member
It was supposed to force the ignition system to switch to a different advance curve at tickover. It didn't work and BMW junked it pretty quickly.


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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)
    

Fentible

Fentible
Silver member
Silver member
Thanks for input Charlie and Dai. Other than the slight drop in tickover revs, the effect if there is any is negligible. I'll keep it connected and see if there is any advantage to fuel economy.

Fent

    

Kyle10

Kyle10
Life time member
Life time member
Can someone post a pic or an image of the part and its location? The TPS?


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1985 K100rt 0052183
1983 Honda VF750 007713 
    

Fentible

Fentible
Silver member
Silver member
There you go the unit on the right with the red vacuum tube attached.

Purpose of Vacuum switch on rear of throttle bodies $_57

    

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