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K100-forum.com » Your own renovation / customization » cafe racer / custom section » Adding a choke to a cafe with non-BMW controls?

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duck

duck
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TJH has a cafe with Busa forks and aftermarket controls. When he was at my place yesterday he mentioned that the bike doesn't start very well.  One obvious reason is that his 85 K100 cafe doesn't have a "choke."

Wondering if any of you cafe builders have found a way to implement a choke with non-BMW controls.


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MartinW

MartinW
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Just a thought, Duck the fast idle control doesn't have to be on the handle bars. You should be able to fit a universal choke control anywhere. You could also use the OEM throttle lock or an aftermarket one to increase the revs for starting.
Regards Martin.


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Dai

Dai
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Use l/h switches with a built-in choke lever. That's what I have.


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1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
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Suzi Q

Suzi Q
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Well the madass just plain doesn't have one, throttles are balanced, ignition is advanced, plugs are good - it starts and ticks over fine. True, I don't ride in sub zero, or even roundabout zero, but I'm also a believer in getting on and riding rather than letting it 'warm up' on a fast idle.
The other thing you could do is install a switch to stop the alternator charging whilst it warms up, it cuts the load on the engine and a switch is much easier to figure out than a mechanism for the fast idle.


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lechicho55

lechicho55
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I was thinking of trying to get a manual choke conversion right at the throttle body's or whatever it is called.  Right at the choke lifting mechanism.  I now they make one for an r80, but doubtful it would work for k as I was just looking at it.  Also worst case scenario I was thinking of totally Mcguyvering it and just cut the choke cable short and use a key chain round thingy and then solder the cable back to its self and bob's your uncle choke pull right at the lifter.  I works out in my head anyway.

    

92KK 84WW Olaf

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Fire it up and ride off. That avoids need for choke. The only time mine ever need choke is if I want to fire it up and let it idle. But I never do that. Otherwise it starts up and I ride off without any problem and just ride gently for the first few miles......


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

Gauntlett

Gauntlett
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I agree with Chris, the whole mechanism is missing from Lucky3 and I have no problems starting, give it a bit of throttle and away it goes.

    

92KK 84WW Olaf

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I do ride in winter and sub zero and never an issue. Yes, it wont tick over on a frosty morning from cold without choke but if I am in gear ready to go and fire up and go there is no issue.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

Clintinz

Clintinz
active member
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lechicho55 wrote:I was thinking of trying to get a manual choke conversion right at the throttle body's or whatever it is called.  Right at the choke lifting mechanism.  I now they make one for an r80, but doubtful it would work for k as I was just looking at it.  Also worst case scenario I was thinking of totally Mcguyvering it and just cut the choke cable short and use a key chain round thingy and then solder the cable back to its self and bob's your uncle choke pull right at the lifter.  I works out in my head anyway.
Did you ever get something sorted Lechicho? I am at that stage now and the old bike needs some help on cold mornings. 
I found these and wondered if they would work 

https://www.caferacerwebshop.com/en/bmw-choke-conversion-set-models-after-9-80-alumin.html

Alternatively do you know the size of the nipple? My bike is in the shop and I want to order the parks while I wait.

    

92KK 84WW Olaf

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Over 14 years of K bikes, quite a few of them, the one thing I don't use is the 'choke'.

Fire it up and ride off. Never lets me down,

I wouldn't even bother with it.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

Clintinz

Clintinz
active member
active member
The thing is Olaf that the bike is not starting with out it. All sensors are working and the auto electrician can’t find any other reason. Tested with the choke and it works. So clearly some k bikes needs it when cold. Just looking for a simple solution and these look positive.

    

92KK 84WW Olaf

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Life time member
Life time member
Clintinz wrote:The thing is Olaf that the bike is not starting with out it. All sensors are working and the auto electrician can’t find any other reason. Tested with the choke and it works. So clearly some k bikes needs it when cold. Just looking for a simple solution and these look positive.

On a very cold morning I just use a small amount of throttle when starting the bike and that works for me. Literally ride off the moment it fires. But, like you have said, it does need it. All the choke does.... it is doing is exactly the same thing, a small amount of throttle advance.

Sounds like you and the auto electrician are on the ball.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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