Rotates but won't start

My KZ750E-L2 was sitting for some time without fuel tank because I was painting it. And now it just rotates but won't start. Before it was starting just fine. I tried to take out the spark plugs and clean them (they were wet) but after this it still won't start. Also I checked for fuel level at the bowls using clear tube and the results for cylinders are:
#1 2mm
#2 2mm
#3 5mm
#4 5mm

I was thinking that the fuel level might be the cause because firing order is 1-2-4-3 and as shown above cylinders #1 and #2 are getting too much fuel and flood? But then again it was fine before with these specs.

If the only thing that has changed was that the fuel tank was off and the bike sat for a while then maybe there is a clue ? How long did the bike sit? If it was months then you may have a "gumming-up" of the carbs/jets - although you say that fuel is getting to the head....? The other variable is the removal of the tank for painting - are you getting spark at the plugs - maybe you've disturbed some ignition/electrics wiring during the removal/replacement of the tank? Also, maybe some paint got where it shouldn't and is affecting the ignition system? Let us know what you find. Cheers, Bill.

Your float hieghts needs resetting, but probably not bad enoughto prevent it starting, form what did run ok by your accounts.

A good diagnostic here is to spray some carb cleaner into the pods/airbox. Even if he carbs are bone dry and If it fires up you can eliminate ((for now) any ignition problems. Don't make a habit of this as it washes the bores of oil, but it can help to narrow down your problem.

I suspect you may have inadvertantly damaged some of the coil or HT lead connections under the tank. New 7mm wires, caps, plugs and new crimped coil connectors are a cursory item for me on ay restoration, even without problems..