Mikuni choke adjustment

  • Pipes66
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Mikuni choke adjustment

20 Feb 2019 05:49
#798918
I think I’ve got bs34’s,they’re the ones with a pull knob on the left that has 1/2 and full choke positions.
Is there any adjustment to increase the amount of choke?
I don’t seem to be getting full choke,it’ll start on 1/2 but if I change to full it cuts out.
1983 kz750 F1 Ltd Shaft US model

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  • baldy110
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Re: Mikuni choke adjustment

20 Feb 2019 18:37
#798958
No adjustments on choke. Did this just start occuring or has the bike been sitting awhile?

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  • Pipes66
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Re: Mikuni choke adjustment

21 Feb 2019 04:18
#798980
This has been going on forever really. It’s never started on full choke,I’ve always had to start on half choke and catch it when it fires. I just want to be able to start it normally,I.e. full choke no throttle.
I’ve recently done the valves and it is a lot better.
As I said,fiddling with the air pilot screw doesn’t do much,I tried it in half turns from 1.5 to 4 turns out.
1983 kz750 F1 Ltd Shaft US model

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  • ajsfirehawk
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Re: Mikuni choke adjustment

21 Feb 2019 11:41
#798991
Once running do you get a change in RPM from the full choke position to the partial choke detent on the enricher rod?
79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1

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  • Pipes66
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Re: Mikuni choke adjustment

21 Feb 2019 12:12
#798995
It won’t start on full choke,if it’s just been started I can put it on 1/2 choke and it’s barely acting like it’s on choke,if I pull it out to full choke it’ll die. But in answer to your question there is a change in rpm from no choke to 1/2.
At the moment it’s starting a lot better than before but I’m doing it without choke and catching it on the throttle,then I’m putting it on Half choke and it’ll idle.
1983 kz750 F1 Ltd Shaft US model

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  • SWest
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Re: Mikuni choke adjustment

21 Feb 2019 14:41
#799013
Float level might be too high. Have you done the clear tube test? I can only put the choke on half way with my 33's. Same for the 28's when I had them on the bike.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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  • old_kaw
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Re: Mikuni choke adjustment

21 Feb 2019 15:40
#799018
The only time I can start my bike with the knob pulled all the way out is if it's really cold. Most of the time, the halfway detent is where it starts best.
1981 Kawasaki Kz1000K1
Located in the Saint Louis, Missouri Area.

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  • Pipes66
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Re: Mikuni choke adjustment

21 Feb 2019 15:50
#799019
I haven’t checked the float height, I had no idea it would have an effect on the choke. What other symptoms would incorrect float height be?

Another thing I’m going to try is a hotter plug,as the manual suggests,the lady who owns the bike is a bit of a plodder. I’m going to go up to br7es’
1983 kz750 F1 Ltd Shaft US model

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  • SWest
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Re: Mikuni choke adjustment

21 Feb 2019 16:21
#799021
Pics of your plugs?
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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  • Pipes66
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Re: Mikuni choke adjustment

21 Feb 2019 16:50
#799022
I haven't got pics,but they are sooty,and the bike floods easily.
The more I read about float height the more I'm convinced that's my problem: Choke problems, hard starting,sooty plugs, occasional fuel leaking back through carbs into airbox.
I'll bet my fuel level is too high. Carbs off in the morning.
1983 kz750 F1 Ltd Shaft US model

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  • SWest
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Re: Mikuni choke adjustment

21 Feb 2019 17:05
#799023
Valves adjusted?
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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  • 650ed
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Re: Mikuni choke adjustment

21 Feb 2019 17:18 - 21 Feb 2019 17:19
#799024
Pipes66 wrote: ...................................
The more I read about float height the more I'm convinced that's my problem......................I'll bet my fuel level is too high. Carbs off in the morning.

Why? Checking the float levels can (and probably should) be done with the carbs on (not off) the bike. Do you have a Kawasaki Service Manual? Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 21 Feb 2019 17:19 by 650ed.

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