For my dirt bikes, scooter, quad, lawn tractor, power washer, blower, trimmer, outboard, etc.... I fire up the engine, then turn off the fuel valve and let the motor run until it dies. Open the drain screw at the bottom of the carb to flush out any remaining gas. Drain the gas tank. Air up the tires. Change the oil (and filter if applicable). Remove the spark plug and spray in a bit of "Sea Foam" fogging oil into the cylinder. Then, disconnect the battery and put it on trickle charger. I plan on doing the same thing for my GROM, however, I don't know if there is a fuel cut off valve...