TOPIC: 28mm VM carbs

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.

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

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.

Bench carb sync

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.

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.

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.

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.

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.

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

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

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.

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

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.

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.

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?

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.

So what do I do bout this, 1986 KZ police tank and petcock hitting the carb.

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!

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.