Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1
  • 2

TOPIC: Mikuni choke adjustment

Mikuni choke adjustment 20 Feb 2019 05:49 #798918

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
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

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 20 Feb 2019 18:37 #798958

  • baldy110
  • baldy110's Avatar
  • Offline
  • Member
  • Member
  • Posts: 1965
  • Thank you received: 350
No adjustments on choke. Did this just start occuring or has the bike been sitting awhile?

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 04:18 #798980

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
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

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 11:41 #798991

  • ajsfirehawk
  • ajsfirehawk's Avatar
  • Offline
  • Sustaining Member
  • Sustaining Member
  • Posts: 535
  • Thank you received: 88
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
06 ZG1000 Concours
02 Trans Am ... not enough time

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 12:12 #798995

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
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

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 14:41 #799013

  • SWest
  • SWest's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 18474
  • Thank you received: 1685
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
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 15:40 #799018

  • old_kaw
  • old_kaw's Avatar
  • Away
  • Member
  • Member
  • Posts: 639
  • Thank you received: 164
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.

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 15:50 #799019

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
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

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 16:21 #799021

  • SWest
  • SWest's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 18474
  • Thank you received: 1685
Pics of your plugs?
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 16:50 #799022

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
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

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 17:05 #799023

  • SWest
  • SWest's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 18474
  • Thank you received: 1685
Valves adjusted?
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 17:18 #799024

  • 650ed
  • 650ed's Avatar
  • Offline
  • Member
  • Member
  • Posts: 14315
  • Thank you received: 2415

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)

Please Log in or Create an account to join the conversation.

Last edit: by 650ed.

Mikuni choke adjustment 21 Feb 2019 17:29 #799025

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
Yes Steve, valves spot on.

Ed,I will check them before removing. I was just anticipating .... I take it the carbs will be off and on several times whilst setting the float height?
1983 kz750 F1 Ltd Shaft US model

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 17:55 #799026

  • 650ed
  • 650ed's Avatar
  • Offline
  • Member
  • Member
  • Posts: 14315
  • Thank you received: 2415
I wouldn't remove the carbs to set the float heights. You should be able to remove the bowls and floats without removing the carbs from the engine. I've removed the bowls from my carbs more than once using either of the screwdriver tools shown below. Ed



1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Attachments:

Please Log in or Create an account to join the conversation.

Last edit: by 650ed.

Mikuni choke adjustment 21 Feb 2019 18:00 #799028

  • SWest
  • SWest's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 18474
  • Thank you received: 1685
In absence of a stand I'd use a couple nails and wire them to a door/wall whatever to set them. Setting the floats can be tedious at best with taking the bowles off and on again. I have old carb holders screwed to a door at a comfortable height making setting them a breeze. B)
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
The following user(s) said Thank You: baldy110, old_kaw

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 21 Feb 2019 23:37 #799033

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
Ed, I thought it may be a faff to re-assemble on the bike. Pete

Steve, if I struggle doing it on the bike with my mahoosive hands I’ll be very glad I have a tall wood topped bench . Pete
1983 kz750 F1 Ltd Shaft US model

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 22 Feb 2019 01:07 #799037

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
Carb no.2 float level is too high. It’s level with top of the bowl,the other 3 are all 3-4mm below.
I’ve reset the float height without removing the carbs,what a b@stard of a job trying to hold the needle jet in place whist re-fitting the float and pin!!,may have been easier on a lift but that was already taken.
Small improvement on half choke,still stumbles and cuts out on full choke.
I think I’ll put the hotter plugs in and let her go have some fun,to her credit she won the club “iron butt” last year. See if a few miles riding round shows anything on the plugs.
Unless you guys can suggest anything before I call her?
Pete
1983 kz750 F1 Ltd Shaft US model

Please Log in or Create an account to join the conversation.

Last edit: by Pipes66.

Mikuni choke adjustment 22 Feb 2019 04:20 #799038

  • Warren3200gt
  • Warren3200gt's Avatar
  • Offline
  • Member
  • Member
  • Posts: 415
  • Thank you received: 110
Are they sync'd. Always makes things a lot smoother at tickover revs. Makes starting easier also.
75 z1b, 77 z650 b1, 77 z650 b1 period custom, 77 z1000 a1, 82 z1100 elr, 89 zxr750h1

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 22 Feb 2019 07:00 #799045

  • scubaanders
  • scubaanders's Avatar
  • Offline
  • Sustaining Member
  • Sustaining Member
  • Posts: 369
  • Thank you received: 107
Have you given the carbs a good clean?
While you have them of, strip them down and give them a good ultrasonic bath. There are a number of small passages that needs to be spotless I order to get these carbs to work 100%.
Ed (Nessism) has written a superb rebuild manual for the Mikuni CV carbs.
/A

Please Log in or Create an account to join the conversation.

Mikuni choke adjustment 22 Feb 2019 07:19 #799046

  • Pipes66
  • Pipes66's Avatar Topic Author
  • Offline
  • Member
  • Member
  • Posts: 67
  • Thank you received: 0
Carbs were synced last year,waiting for a mate to lend me his set to do them again,doubt it’ll help the choke though ;)

I’ve lost count of the amount of times I’ve stripped and cleaned them,I’m told a friend of hers at z parts ultrasonically cleaned them too,last year.

It’s been a constant problem this choke issue but as I said,it’s better now than it was so it’s a result of sorts. I’ve put the Ngk br7es’ in now so the plugs stay a bit cleaner, she’s gone to put some miles on it now.
1983 kz750 F1 Ltd Shaft US model

Please Log in or Create an account to join the conversation.

  • Page:
  • 1
  • 2
Powered by Kunena Forum