Well, here are a few suggestions but I've no experience of the model. It's 2-stroke right?
Fuel: Is the tank vent blocked? When it cuts out open the cap. Is there a whoosh of air entering.
Open the carb drain screw and check for fuel in carb.
Ignition: Is there spark at the plug? Check elec. connections are sound. (Does it have points?)
Maybe the engine is overheating and seizing: Will it turn-over when after the problem appears? Is there oil in the 2T tank?. (Maybe it's a fuel-oil mix?). Have you meddled with any carb screws?
More detail on these questions needed for further diagnosis.
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