Choke Assembly Diagram on KZ750?

Regale us of what you "really" think of the overt quackery of the CV carbs, ha. Your bane stems from not understanding, not the design. These CV's have been around since the 60's if not before. Bing, Stromberg, Keihin have been mass producing these for cars/bikes for years. Harley used a "stamped HD" CV for years, really just a Keihin manufactured in disguise in an attempt to fool the buyers to thinking "made in America". That "plug" you wondered about. Without it you might as well just leave the main jet out because the casting is drilled diagonally. The pilot jet gets it's source fuel from the main jet. Also if you just reused the old rubber plug and it was hard and stiff you're going to have problems, that passage has to be plugged-up or it's going to run rich if at all.     

chopper1963 wrote:

Truly a convoluted way to get an air and fuel mixture into a cylinder.

CV carbs were bad enough but then when they were half destroyed by rotting ethanol they became a boat anchor on 1980s and 1990s streetbikes.

It's no wonder younger techs in a motorcycle shop won't even touch a bike with carbs.

This is unfortunately a "sign of the times" (try asking a young guy in a car dealership to adjust valve clearances !!!) Generally speaking "tech school" don't teach old technology 

Nail square on the head Wookie!! All dealerships around here won't touch a bike over 12yrs old. Those young kids, unfortunately, can't find a port to connect their OBD scanner to on a carb engine. And with all the "scare" labels of cancer, doubt they would attempt getting carb cleaner on their hands, ha. 

Right. You sell o-rings right?

Very soon all the old carbs guys will be dead and the only remaining memory might be of from then middle-aged techs in the dealership Reminiscing about how some old coot would go on and on about how great CV carbs were and it was just that people didn't understand them. By that time the old techs in the shop will be the guys who can remember burning EPROMs

Funny you mentioned EPROMS. They were just a hint into the "later" CHIP era. Of course the eprom/prom and rom followed suit. I have been dealing this stuff for years, back when TTL and CMOS became popular. As such the "boat anchors" you call them, what about the radios of yesteryear..trash? Everything in advancement had it's place and shouldn't just be shuffled off as old crap. I have a background in early digital chip electronics which is why these "simple" harnesses for these bikes seem to be breezy to me. Maybe not soo much for the person not familiar so i Love to Help and not be jaded by my experiences. Here to Help as constant responders here are! A photo of the ole simple heated transistor thru it's lineage. I revel in the coot (ness)    

chopper1963 wrote:

Very soon all the old carbs guys will be dead and the only remaining memory might be of from then middle-aged techs in the dealership Reminiscing about how some old coot would go on and on about how great CV carbs were and it was just that people didn't understand them. By that time the old techs in the shop will be the guys who can remember burning EPROMs

Please forgive me but I am confused !! why did you buy a bike of this era if you have such an issue with 50 year old technology ?
As an aside, modern fully electronic systems still have mysterious faults but they just cost more for techs who rely on an OBD scanner to tell them what to change (scanners are intended as an "aid" not a magic answer to everything but it's common place to replace what ever the scanner shows as a fault and then diag it later when the new part (that you will pay for anyway) doesn't fix it !!!!!!) I could bore you to sleep with stories of where I have seen this happen in "main dealers" not "back street" garages.