Need INFO on vacuum source for petcock KZ1100

I just acquired a KZ 1100
(82, carbs, shaft-drive)

The previous owner capped off the 2 vent hoses at the front of the engine, and the vacuum ports on the 4 carbs. There is no vacuum to the petcock at this time.

Can anyone tell me if this setup is workable, or should I restore the crankcase vent system?

Where should I get the vacuum for my petcock?

Or is there a solution for a conventional petcock?

Any advice and comments appreciated!

Thanks!!

The 2 larger hoses on the top of the engine are for the clean air emissions system and would not work for the petcock. You should have a vaccuum outlet port on one of the carbs, my older bikes always had it on #3 carb. If there isn't one you can use any of the 4 nipples on the 4 rubber intake manifold rubbers that mount the carbs to the head. Just run a hose from one of them to your petcock, doesn't matter which one.

Ditto to Ron

Thanks for the quick replies!

Where on the #3 carb is the dedicated vacuum port for the petcock?

My carb to head mounting boots do not have a vacuum port.
Do I need that emissions control system that has been capped off?

FloridaBiker wrote:

Thanks for the quick replies!

Where on the #3 carb is the dedicated vacuum port for the petcock?

My carb to head mounting boots do not have a vacuum port.
Do I need that emissions control system that has been capped off?

Start the bike up and put your finger on all the ports you see. The one that sucks is it. Make sure you put the caps on all the others.

No you don't need the emissions stuff.

FloridaBiker wrote:

I just acquired a KZ 1100
(82, carbs, shaft-drive)

The previous owner capped off the 2 vent hoses at the front of the engine, and the vacuum ports on the 4 carbs. There is no vacuum to the petcock at this time.

Can anyone tell me if this setup is workable, or should I restore the crankcase vent system?

Where should I get the vacuum for my petcock?

Or is there a solution for a conventional petcock?

Any advice and comments appreciated!

Thanks!!

Welcome to the site.
The link kzrider.com/component/option,com_docman/...oc_download/gid,136/ should take you to an article that shows the vacuum port for Mikuni carbs. See figure 24.
I could not find the wiredgeorge link I was looking for, as it shows full hook up but that one will do.
A lot of guys just do away with the vacuum petcock, but, since buying my '78 KZ1000A I have ridden almost 350 miles now and never had a problem.

I will try to get you some pics

These are my carbs. Notice the rubber capped ports pointing upward in red, those are your vacuum ports. My vacuum line is on the second carb, since all are the same anyways, so you can put it on 1 if not in use by the emissions system

its in the front of the carbs as the first pic doesn't show. Theres also snow here so never mind that.

Thanks for the help guys!!