Check the valves as they may be tight . Way too tight it may not start at all . Tight they tend to start then the engine wants to stall once warm since the valves are not opening up and restricting air a fuel from powering the engine . All 4T scooters will need to have the valves adjusted at least once with some needing it done out of the crate .
There is several how to do videos on you Tube to do this procedure that baffles most shade tree mechanics since it is getting fire , fuel and compression but not run correctly .
Buy the Haynes Chinese Scooter repair book . I bought a used copy from Amazon for 6 dollars with free shipping . It averages 25 or so new .
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