Hi. I have this very same bike with thew very same problem.I put pods on and fabbed a 4-2-1 header. It is very lean during the mid and was lean on the top, but not as bad. Ran a 125 mainjet and she's too fat. Going back to a 120 main and going to run a different needle. I turned my needles down by hand and it got significantly better, but I screwed the off-idle up. I am convinced that I am on the right track with a needle swap. Going to run a 5FL14. I will post the results.
Patton wrote: For carb tuning considerations, if not already aware ---
Main jet size has no effect on air/fuel mixture until after 3/4 throttle, and has most effect at wot where the jet needle is high enough in the needle jet to allow all mixture available from the main jet to pass through the needle jet.
Jet needle taper and position in the needle jet (plus slide cutaway) governs air/fuel mixture from 1/4~3/4 throttle.
The pilot jet governs air fuel mixture from idle~1/4 throttle.
Up to 1/4 throttle position on large Kaw fours produces a surprisingly brisk road speed.
There is a progressive transition as the jet needle takes over from the pilot jet, and another progressive transition when the jet needle thereafter surrenders to the main jet (as the main jet supplies the needle jet absent limitation by the tapered jet needle).
Pods are typically more difficult to tune (than the stock air box) over the entire range of carb operation.
Thanks, very interesting about transition from needle to main.
If you really want the fewest problems, put the factory intake system (air box, filter, and all) back on. If you have a 750 twin with BS34 carbs, they are notoriously difficult to tune for individual filters, and you will likely loose a little performance along the way.
Unless you are going to add high compression pistons, ported head, high performance cams and bigger carbs, there really is no point in individual filters. The stock setup flows as much as the stock engine needs.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Actually I have a kz 750 ltd 1982, heihin carburetors. But Im so fucking confused because of leaking fuel to the airbox. And when I open the carburetor the float valves mooves freely, have already cleaned EVERY part of the carburetor, the only thing I think it is, is a dirty diaphram inside the petcock because of a dirty gas tank.