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Ride the scooter to where you are going shut it off go in for 10 or fifteen min, come back will not restart, unless you wait a couple of hours. when checking found we loose spark. Tried 3 known good cdi, known good coils. The neat thing is if you put the cdi in the freezer for about 10 min reinstall, will start right up like nothing is wrong. None of the good cdi will restart while cdi is in the freezer, after it restarts, other CDIs will work. This a new 50cc 4 stroke engine, less than 25 miles, The scooter is a baja sc50 the original engine had bad crank and transmission bearings. Had to rewire from DC to AC for the new engine. Any one have any thoughts on this.