MOPED ARMY

Very very likely it's a loose hose from the intake or near it. possibly dirty carb. all that can be accessed relatively easily through the bottom of the undrseat compartment. little flip open flap wit ha phillips screw. then pull the boot off the carb and yank it ut, clean it up, and check for loose hoses (there's one that's a drain off the bottom of the carb that should be loose - it's just a drain hose for when you open the little screw on there to drain out the carb's bowl)

actually - that's a great point - it could easily ust be water in the gas or in the carb - try draining it first, little screw either directly on bottom of the carb or more likely partway down a tube that comes off the bottom of the carb.

it could be a wiring problem.

could be the breather in the tank cap is clogged creating a vacuum in your tank and not allowing fuel to get to the carb, try running it with the cap loose or off for a while and see if that's the issue.