93 suzuki katana won't start

Hi, it could be that the switch inners are not functioning properly, open switch and make shore it is cleaned and working ok,and check wire connections are good, just food for thought, all the best.

To stop a dieseling two stroke motor you can either choke them out (full choke) or block the air intake with a rag and starve the motor for air. Chances are the carburetor slide is sticking in a wide open position. Take the carburetor apart clean and inspect it. Also inspect the intake manifold for cracks and air leaks. For normal running add a kill switch so you can stop the motor without having to unplug or ground the spark plug. If the motorcycle is completely stripped except for a power wire to the coil, add the kill switch between the generator (wire coming out of the motor) and the coil.

some models need the clutch in (even in neutral) to start, Check if there is a small micro switch under the clutch and check it works with a multi meter

Make sure kill switch is OFF first, then check if there are nay Neg loose cables. especially in the starter motor connection. Good?

check spark plugs, disconnect and reconnect the module.

sounds like a bad diaphram in one of the carbs

Not for sure but u might try to re jet the bike.i own a 98 suzuki bandit 600s and it also is really cold hearted. those bikes are unfortunately known for that problem.not that it was much help but u might try contacting Dales Holeshot Performance he specializes those types of bikes he also sells the jet kits.
i would also try to adjust the idle slightly higher hope this at least helps

u have the mixture screw wound in to far. its normally located on the bottom of the carb. try winding it out half a turn at a time once the bike has warmed up. also turn the idle screw out a quarter of a turn at the time its in to far thats why it idles at low revs. the choke is needed to keep the air fuel mixture right thats why u are having to leave it on for so long. hope this helps.