Carb Identification and Help Setting Up

Hey guys, I just got this bike and its my first Kawasaki and also its kind of customized. The bike is an 81 KZ650H that has had the engine swapped to a KZ750 LTD motor. I was trying to research what kind of carbs these looked like and trying to figure out how they hook up to everything so they work properly, but that been a tough one. Being new to these bikes and this not being stock I dont know what everything was like originally. I plan on buying a set of pods to put on it, so I dont know what all the original airbox connected to, so I dont know what hoses or things will be lying around extra and what to do with them. Heres pics of my carbs awhile and any info you guys can give me would be fantastic!















Some things I noticed in diagrams was that there were lines coming off the bottom of the carbs float bowls which arent there on mine. Also my carbs are constantly slow dripping gas from those float bowl nipples. The one pic I took of where the throttle linkage is I noticed it looks like there is a line that is supposed to connect into it but there is nothing there. Im assuming it could be a difference from 650 CSR to a 750 LTD? Thanks in advance!

Those are the older 24mm carbs from a 650 motor,you can tell by the ribs on the bodies

wireman wrote: Those are the older 24mm carbs from a 650 motor,you can tell by the ribs on the bodies

Thanks, now is there anything I need to be concerned about with them working on a 750 motor? Is there a diagram or pics that could show me how they hook up and everything? Do the carbs have a specific title (ex. Mikuni _____)?

Maybe vm24 or something like that.
Im guessing just a fuel line and some vacuam fittings to plug

Bottem picture is throttle cable connection

Agree they look like vm24ss carbs. They should have an ID stamped on the flange just below the choke lever. IF you post what the ID is I should be able to tell you what model(s) they were stock on and what they jets and other internals were stock.

gd4now wrote: Agree they look like vm24ss carbs. They should have an ID stamped on the flange just below the choke lever. IF you post what the ID is I should be able to tell you what model(s) they were stock on and what they jets and other internals were stock.

Awesome! I will get right on that as soon as it gets light out again (garage has no electric). Meanwhile I forgot to mention that I was able to ride the bike home so they function, but it would only stay on with the choke applied. I had a long ride home and when I came to a stop I had to keep some throttle on to keep it from stalling. As soon as I got home and put it in neutral and let off the throttle it stalled. PO thinks its the lack of air filters causing this, and I think that plays a part but I think theres more to it...

Ok, heres a pic as promised. I have no idea whether they are 1's or 7's but thats all the numbers that I found located where you told me to look. I also took the number off the engine and that reads KHI KZ750EE064238

OK that makes them a set of 1401 Mikuni VM24ss carbs which came stock on the kz650 H1(CSR) model.They were set up rather lean from the factory, most likely to meet EPA standards.

So I would say they are the carbs that came stock on your bike, and were used with the replacement engine when it was installed. The carbs, as your pictures show do have an accelerator pump and stock came with the following:
Main jet 92.5
pilot jet 15
jet needle 5CL30 - only one slot so have to shim to adjust
needle jet AO-5
Throttle cutaway 1.75
pilot air screw adjustment

Without out air filter(s) it will be running lean and that is why you need the choke to keep it running. You should open the carbs up and see just what size jets it is currently running before you try to rejet. You also have to decide what sort of air filter(s) and exhaust you will be using.

If you are going to be running the stock air filter and exhaust, it will run with the stock jetting as noted above, but it was rather lean from the factory and I would suggest you will get better results if you use 102.5 main as a starting point. That is the size of the stock main jet in most of the KZ650s with the vm24 carbs. IMO it would be a better starting point to begin the tuning process.

If you are going to run non stock air filters and or exhaust then other changes will certainly be necessary.

Wow, that is fantastic info! Thanks so much! The exhaust on the bike is definately not stock. The PO referred to it as MX3 exhaust (if anyone knows what that is), and I love the way it sounds so I plan on keeping those mufflers. As far as air filters go I planned on buying 4 pods for it, BUT if you think I could get away with putting on a stock 650 air box and NOT have to rejet the carbs, then I would be all for that. Maybe in the next few days I will yank off the carbs and evaluate what jets are in them... Are they labelled as to what size they are, or do they need to be removed to tell? Ive never torn carbs down before or even cleaned them, so this is a learning experience for me

There are little balls in the rear of the bowls, so be careful you don't lose them. Keep all the parts separate from each other and return them to the same carbs. Clean the float needles well, that's why they're dripping. You really should do the whole carbs. You don't have to take them off the rack. Buy a Kaw factory manual, it's invaluable. Bob
B

never mind goofed