83 KZ750 shaft keihin pilots?

There isn't even any threads in the hole where the secondary jet would be. And the pilot jet is only supposed to have the plug if there is a little pinhole in the pilot jet that leads to the main jet. Everything that is in the carbs is in it in the pictures except the floats and float needles. If you look at the picture of my service manual, you'll note that there were 2 keihin carbs for the 750-4. Yours are the other type. One has the secondary jets one doesn't.

That is right.
Late 82 and 83 model had the Keihin CV34:

Secondary main #100
Jet Needle N10C
Pilot #35

Earlier 80 and 81 had the Keihin CV34:

jet needle----N01A
main jet primary----#62
main jet secondary---#125
pilot jet---#35

This set has a particular nice transition from idle to wide open throttle.

Am understanding that the exhaust system at hand is a 4>2 without baffles.

May have overlooked, but not seeing description of the air intake system -- stock air box? Pods? Type filter? Paper? Oiled mesh? Foam?

Good Fortune!

undiablo wrote: That is right.
Late 82 and 83 model had the Keihin CV34:

Secondary main #100
Jet Needle N10C
Pilot #35

Earlier 80 and 81 had the Keihin CV34:

jet needle----N01A
main jet primary----#62
main jet secondary---#125
pilot jet---#35

This set has a particular nice transition from idle to wide open throttle.

Ahhhh. The light goes on,!!!
That would explain it. Something I had not known.
My apologies for the confusion

Patton wrote: Am understanding that the exhaust system at hand is a 4>2 without baffles.

May have overlooked, but not seeing description of the air intake system -- stock air box? Pods? Type filter? Paper? Oiled mesh? Foam?

Good Fortune!

Correct. The exhaust is the stock 4 into 2 without baffles. I hollowed the megaphones. Airbox is stock with a stock air filter. New boots on both engine and air box side. New o rings in pilot screws. Pilot screws are all about 3 turns out. Valves are within spec. Iginition coils read 2.6 ohms on both. I am assuming from the way it seems like its starving for fuel that its the pilot circuit. So i would like to go up in sizes on my pilots and mains both. My local shop says I should be at a 45-48 on pilots and a 130-140 on mains. I was gna try drilling my stock pilots cuz you can't get anything bigger and go up slightly each time til it runs right. And buy some mains from z1 and start at 120 and work up if needed. Thoughts on this?

It sounds way too much for me... never heard of any KZ750 with Keihins running 45-48 slow pilot jets. Just my 2 cents.

Pd: you should clean the carbs internal passages like if they were surgical tools.

I am assuming that is quite a jump also. I was thing maybe like a 40 pilot and a 120 or a 110-115 main. And my carbs are completely free. I am getting spray out of every place I am supposed to. I have read pretty much every resource diagram, forum, etc on all the little passages people usually forget or don't know about and they are all clear. Float heights are set properly using the clear tube method.

Ok, in that case change only one thing at a time.

I would start with upgrading the main jet from 100 to lets say 110.

Okay. sound like a plan. Would 110 be a good starting point? I am hoping to not have to buy a ton of different jet sizes. And I'm aware that is definitely something that might end up happening. I know jetting is all about trial and error. The jets from z1 are only ~ $3 each but that adds up quick when you factor in shipping and buying several sizes. Not mention wait times for shipping. And my local shop isnt much better. I only have a honda shop nearby, and the closest kawi shop is about 20 miles away. Our local kawi shop just went out of business

Imagine my situation living in Argentina. .. buying from z1e is about 15 days shipping and 5 days at customs office. Then paying 50% tax...hahaha. Living hell.

110 is a very good starting point. Let us know how it works!

When new, the bike performed well with 35 pilot and 100 main.
The most significant difference between then and now is removal of the baffles.

Would retain the 35 pilot. Especially if there's consistent idle with strong pullaway and smooth performance at low throttle positions. Which indicates the pilot screw is capable of maximizing low rpm performance with the 35 pilot jet, absent the muffler baffles.

Would perform high speed throttle chop testing (plug readings) to diagnose whether a larger main would provide improved mixture at wot. If only very slightly too lean, perhaps one size larger main would be sufficient. But it's usually a matter of testing with different main jet sizes to achieve the best mixture at wot.

Would not expect a larger main to have much if any effect on mixture at less than wot. Because at less than wot, the mixture is mostly controlled by jet needle taper inside the needle jet.

Good Fortune!

Another question. measured my main jets, and they are 6.2mm total length, 4.3 mm head diameter, and 3.4 mm thread diameter. I found them on jetsrus, and they are part number KEIHIN 1001-108. The problem is, they are really small. They don't even have a 100, which is what I have in the bike. They are also calling them starter jets, not main jets. I don't understand what I am reading. Can someone explain this to me?