Kawasaki Ninja 250 running problem

HI JERRY
HOW IS THE FLOW DOWN FROM THE TANK OR FUEL FILTER
MAY NEED TO CHANGE FUEL FILTER OR CHANGE FUEL LINES OR TANK VALVE BECAUSE USING FULL CHOKE SUCKS THE FUEL AS HARD AS THE BIKE CAN TO GET FUEL THROUGH THE SMALL LINES LET ME KNOW WHAT YOU FIND OR DON'T FIND

That's why sensible people put exhaust pipe shields over their pipes. Buy some soon or burn yourself!

I used to have a 87 EX 500. Just about the same bike.
It locks to the inside edge of the fuel tank and it seals tight so its not going to come off.
If you can load the bike in a pick-up and find a locksmith that can cut a Kawasaki key, they can be pretty good at cutting a blank. They may also be able to pick it and then make you a key.

you have blocked jets in the carbs,,the carbs need to be removed and cleaned.

The jets/passageways in the carb are likely plugged with bad gas, hence it will run with the choke on. Common problem with the 10% ethanol gas.

Did you try adjusting up the Idle some ?

Wow, quite a long time in storage. Anyway when you store it so long you need to clean and replace everything, YES, everything thatr can be affected by moisture, dust and condensation.
Main concern must be for all fuel and combustion systems flows including re-newing all oils before using the bike again. Have you cleaned the carb and fuel lines? Change the air and fuel filter?

this is very rare. if the engine kill switch is in the same grip, check it , it may be shorting/ loose/ defective. only other possible thing is the starter relay switch