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6v or 12v? You need to determine if it is spark or fuel related. Next time it does this, check quickly for spark then fuel. Get an old plug, open the gap to 3/16, ground it to a rust & paint free spot on the head, turn the key on & crank the engine. You have three possibilities: no spark, weak and/or intermittent yellow spark, or a bright blue spark. What is it? Next, check for fuel. Remove the bolt in the bottom of the carb; as long as the fuel is turned on, you should see gas flowing out of the carb. As a good rule of thumb, a 1 - 2 minute run times is usually the condenser, ballast resistor, or vacuum lock....or, failure to turn the gas on. A 5 minute run time is usually fuel screens. A 15 minute run time is usually the ignition switch. A one hour run time & then restarts after it cools down is usually the coil.
Post back w/ the results of these tests, & tell us how long it runs before it shuts off. Lots of folks here can help you get it running.
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