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TOPIC: 28mm VM carbs

28mm VM carbs 30 Oct 2019 10:58 #813273

  • hardrockminer
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I put the wire between the bottom of the venturi and the notch in the slide. Some people use 22 gauge wire. I use 20 gauge.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.
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28mm VM carbs 30 Oct 2019 13:47 #813280

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hi zilla i think around the 12 july this year under the carb section there is under cable adjustment heading a good write up on some vm 28 carbs ,i am also cleaning a spare set of 28mm carbs as a spare set ,you done well with yours from what they were like ,david

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28mm VM carbs 30 Oct 2019 13:53 #813281

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david richard wrote: hi zilla i think around the 12 july this year under the carb section there is under cable adjustment heading a good write up on some vm 28 carbs ,i am also cleaning a spare set of 28mm carbs as a spare set ,you done well with yours from what they
were like ,david


Thanks David, this is my first time working on or with these carbs, I’ll check out the write up, I’m gonna bench sync them and I had to order a new throttle cable the one I have want work , so I can’t drive it yet to see how it runs.
1986 KZ1000P
2005 Vmax

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28mm VM carbs 30 Oct 2019 14:22 #813283

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Bench carb sync

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28mm VM carbs 30 Oct 2019 14:32 #813285

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So the wire will be on the engine side of the carb ? I was thinking it went on the side with the small notch on the slide.
1986 KZ1000P
2005 Vmax

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28mm VM carbs 30 Oct 2019 14:46 #813286

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The small notch on the intake side could be de-formed (out of shape) by the slider pressure if you use a steel wire!!!
This could cause some (high/rough) idle trouble on the pilot Jet jeting air/fuel Ratio.

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28mm VM carbs 30 Oct 2019 15:15 #813288

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Scirocco wrote: The small notch on the intake side could be de-formed (out of shape) by the slider pressure if you use a steel wire!!!
This could cause some (high/rough) idle trouble on the pilot Jet jeting air/fuel Ratio.


Ok so I’ll stay away from that side, I have some 20ga copper wire that I had left over from a underground dog fence, I think it will work and it’s softer than say electric fence wire.
1986 KZ1000P
2005 Vmax

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28mm VM carbs 30 Oct 2019 16:32 #813295

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I measure from the outlet side, but I don't think it really matters. Copper wire is softer than the slides so it doesn't mark them.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.
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28mm VM carbs 30 Oct 2019 16:47 #813297

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Copper wire is softer than aluminum and does´t mark them but steel wire does imprints on aluminum!!!!
Anyways later you have to do a vaccum sync after a valve clearence check to get a smoth idle running.

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28mm VM carbs 30 Oct 2019 16:50 #813298

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Yea I’m gonna use either the copper wire or some plastic pieces I have I use on some rc cars I got
1986 KZ1000P
2005 Vmax

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28mm VM carbs 31 Oct 2019 12:32 #813330

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By any chance any one know the float height in mm I got one over flowing and I don’t have the little screw and tube to check it according to the manual, I was hoping someone would know the measurements off the carb body mating surface
1986 KZ1000P
2005 Vmax

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28mm VM carbs 31 Oct 2019 12:40 #813331

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On Z1 carbs I close the float valve with my finger carefully pressed on the tab and measure the height of the float from the edge of the carb. It's about 16 to 17 mm. That gets me in the ballpark. But not sure if all VM's are the same.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.

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28mm VM carbs 31 Oct 2019 12:42 #813333

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hardrockminer wrote: On Z1 carbs I close the float valve with my finger carefully pressed on the tab and measure the height of the float from the edge of the carb. It's about 16 to 17 mm. That gets me in the ballpark. But not sure if all VM's are the same.


Ok I’ll try and see , one is wrong now anyway so taking them off and on is unavoidable anyway right lol
1986 KZ1000P
2005 Vmax

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28mm VM carbs 31 Oct 2019 17:05 #813345

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Do it with the floats installed. Just press down on the brass piece directly over top of the float valve. Depress the valve lightly until it's closed and then measure the amount of float sticking above the edge of the carb bowl.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.
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28mm VM carbs 31 Oct 2019 17:46 #813348

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If you take a piece of vinyl tubing and grind sort of a pencil point on it you can then screw it into the float bowl threads to make a "clear tube" gauge. That's the best way I've found measure fuel level, not from measuring float height.
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28mm VM carbs 31 Oct 2019 19:24 #813351

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Nessism wrote: If you take a piece of vinyl tubing and grind sort of a pencil point on it you can then screw it into the float bowl threads to make a "clear tube" gauge. That's the best way I've found measure fuel level, not from measuring float height.


How long of a tube, if it’s to long want it give a false reading?
1986 KZ1000P
2005 Vmax

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28mm VM carbs 31 Oct 2019 20:17 #813352

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Zilla wrote:

Nessism wrote: If you take a piece of vinyl tubing and grind sort of a pencil point on it you can then screw it into the float bowl threads to make a "clear tube" gauge. That's the best way I've found measure fuel level, not from measuring float height.


How long of a tube, if it’s to long want it give a false reading?


A long tube is no problem but don't loop it down any more than necessary; guide it up from the float bowl drain up to the side of the carb and secure there.

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28mm VM carbs 05 Nov 2019 08:42 #813580

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So what do I do bout this, 1986 KZ police tank and petcock hitting the carb.
1986 KZ1000P
2005 Vmax
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28mm VM carbs 05 Nov 2019 14:03 #813599

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Interested in your journey! I would suggest getting a Pingel tap for your tank. I am sure it isnt as deep...and there are lots of different outlet configs....plus they flow way better.... i have one on my KZ1000 with 36mm RS carbs...very thirsty!
1975 Z-1B
1981 KZ1000J
A BMW and a bunch of Brit bikes...

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28mm VM carbs 05 Nov 2019 16:35 #813606

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Can't help you with the petcock but I do know that typically there is more of the treaded adjuster showing on the sync screws above the nut. If you are not careful you won't have an effective range of idle adjustment with the knob.

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Last edit: by Nessism.
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