Carburetor Identification Z12 00 ? Z900 ?

[DeadZedDave]

Can anyone identify a set of unusual looking carburettors ?
Previous owner said Z900.
Code on inlet flange is Z12 00
Carb is 26mm bore VM26
Only single idle mixture screw on top side - no volume control screw underneath.
Unusual looking synchronisation mechanism under top covers (3 screw cover) NOT the usual single screw/locknut adjuster. Has a 2 part mechanism with a spring, a bolt and a screw / locknut - looks just like the mechanism in VM29 SS Smoothbore. Not a smoothbore carb though.
Outside of inlet horn where Airbox fits has only one ridge / ring around the outside - the normally bigger second ridge (closest to carb body - stops the airbox pushing on too far) is missing except for a short section approx 8mm at the top / 12.00 position.
Float bowls, floats etc look like usual Z900.
Choke plunger lifters look like Suzuki style (but could have been changed - carbs have clearly been worked on / dismantled)
ALL SUGGESTIONS WELCOME !!

[warren3200gt]

Picture?

[zed1015]

Single mixture screw means they are Kawasaki.
Only Suzuki VM's had both.
Smooth bore style lifters were on some early vm26mm's.
Think they may have been one year only.

[DeadZedDave]

Early Z900 ........

[Z1streetfighter71]

As far as I can see they are 1976 Z900 & 1/2 year early 1977.
1978 had the standard KZ1000 26mm, they had the air screws under neath the bodies. And Factory had a small white plastic limiter cap on it to limit playing with them.

[DeadZedDave]

Thanks for the responses gents. Just I'd never seen another set the same in over 40 years ! Every day's a school day .....

[DeadZedDave]

Thanks for the responses gents ! Just I'd never seen another set the same in over 40 years. Every day's a school day....