34mm Carb holders w/vacuum plug for a mikuni upgrade1980 KZ1000 B4 LTD

Hey guys... If anyone has....'' or knows someone'' who has upgraded their Carburetors to Mikuni RS34-D21-K on a 1980 Kawasaki KZ1000B4 LTD ,
I'd be interested to chat,.... So here's the story....
I'm trying to keep the bike as original as possible, but the old carbs had to go! and everything else is good ,to stay, the way it is.

''My problem is, finding a set of 34mm carb holders with the vacuum plugs'' , to be used for two reasons......to sync the carbs , and also hook the clean air system backup to it's original condition....and get it going.
I know many of you have done away with this system, and changed over to pod filters...for the reason of producing more Horsepower, but it goes fast enough for me
and the new Mikuni Carburetors will probably add another 5-6Hp.
I noticed some Yamaha 34mm carb holders on Ebay ,which looked like they would work, but don't want to gamble and find out after the purchase that nothing fits right.
Also checked out Z1 Enterprises, and can't find the one's with the vacuum plugs.
I have includes a picture below... These carb holders do not have vacuum plugs.
Got my fingers crossed
Best Regards Karl

Don't the new carbs have ports in them?
Steve

Why replace the stock carbs? :

Good Fortune!

Mikuni Flat Slides Have Vacuum ports on them.

The vacuum ports are on the carb body

Steve, You're right, I found them and therefore I could use them to connect the clean air back up.
Just wondering if there is a 34mm carb holder available with the vacuum plugs, possibly from another year or model ,which uses the larger carbs, that may fit
My 1980 Kawasaki 1000 B4 LTD.
My reason for this setup is , that when I do a Carburetor sync , the gauges would indicate the precise vacuum with the clean air emissions connected to 1&4 carbs

As they say ... a picture is worth a thousand words......Thanks,Scirocco ''and very much appreciated''
I found them! wahoo....
Just purchased them recently, and just getting to learn about the set up. the instruction sheet could certainly use some improvements.
Since you have them pictured
Looking on the reverse side, there are 2 spigit tubes , for each carb, for a total of 8 .The sheet indicates that they are Float Bowel Vents
why are their 2 per carb? , isin't 1 good enough, can one be blocked off and just use 1?
I noticed that they are meant to be connected by a small, long black plastic hose supplied ....where to they go and terminate? I think they would route to the air box preferably
downstream of the air cleaner unit...Is this a correct assumption? I'm sending pictures.
Thanks
Best Regards Karl

This is a good question, and I will try my best to give you a good answer, without a long winded story.
I purchased this bike for parts originally for a 1979 Kawasaki KZ1000 B3 LTD full restoration ,as many parts are interchangable
and decided later to restore this one as well ( my weakness for Kawasaki 1000's i guess)
The bike was messed with, but still ran a couple of hundred yards down the road for a test drive. The engine was later rebuilt by a qualified racing specialist in USA
.....and I had all kinds of options to consider, and decided that if the motor was to be completely overhauled to the last detail , it would be a good idea to change the carburetors as well . It really was his recommendation to upgrade and suggested the RS34-D21-K smoothbore.
The VM 28SS carburetors , which came stock , with the 1980 Kawasaki KZ1000 B4 LTD , looked like a dog's breakfast and needed parts and cleaning.
The Diaphragm Sensor and Cover for the sensor (#14025-1121) were missing, and the previous owner, or repair shop, played around with both air and fuel jets.
A Lot of the service receipts also indicated an on going problem with carb adjustment , probably trying to correct the blue exhaust pipe issue, I believe.

Comparing the cost of fixing, cleaning locating, shipping, etc ...I decided to go with his recommendation, as the newly built motor will now have a welded crank due to an out of index problem found, during the build. New cams, larger pistons, transmission cut, oil cooler,
I could have went all out , but too old for crazy HP ...therefore it was a compromise between a little more power and gas milage .
Not sure what the gains are , but the last time I called and asked , he said...not sure, bring it down and we'll put it on the Dyno and you don't have to worry about the Redline any more.
I checked the carbs again and I believe there not CV, as there is no butterfly valve on the engine side throat. Mikuni RS34-D21-K.
Anyway ,...what do I know...
All of you have been great about sharing your knowledge and experience, I'm truly grateful.

Best Regards

To get back to the original question, I don't think you will be able to find carb holders with vacuum ports. I have read about people installing their own by drilling a hole in each holder that is just large enough to accept a brass tube the same size as the factory ones. The trick seems to be making sure to use a bonding agent that will bond the rubber to the tube, and getting the tube perfectly sealed. You will want to insure that the tubes do not hang down into the air flow, and that the are properly angled to allow easy access. Copying the factory setup would likely be best.
I seriously doubt that the Clean Air System has any effect on synchronization, as the only involvement of the carbs is to provide a little vacuum for the switch. The system draws filtered air from the air filter box and routes it directly into the exhaust ports. The added air aids in burning off any unburned fuel, and dilutes the exhaust gasses so they appear cleaner to a tailpipe sniffer.

I have never seen 34mm carb holders with vacuum tubes. The main reason is the carbs normally mated to those are constant velocity carbs - and they don't typically have any need to vacuum sync.

The second part of this - and you haven't talked about what are you using for the airbox? The diameter for the rubber hose is much larger for the 34mm carbs.

Jeff.Saunders wrote: I have never seen 34mm carb holders with vacuum tubes. The main reason is the carbs normally mated to those are constant velocity carbs - and they don't typically have any need to vacuum sync.

The second part of this - and you haven't talked about what are you using for the airbox? The diameter for the rubber hose is much larger for the 34mm carbs.

CV carbs don't need to be synchronized? Both of my factory service manuals (KZ1000 and ZRX1100) say they do.

TexasKZ wrote: CV carbs don't need to be synchronized? Both of my factory service manuals (KZ1000 and ZRX1100) say they do.

Correct! they need to by synced just like any carb.
The adjustment sets the butterflies which the govern air intake (and then the suction on the diaphragm) just like a slide.
Most CV carbs have their own vac ports on the carb body hence the absence of the vac tubes on the holders.