There are several possibile causes, as all the posts below offer valid suggestions.When it dies out, does it re-start IMMEDIATELY, or does it have to sit awhile before it will restart? .....If it restarts immediately, this usually rules out ignition problems, and may be caused by the float sticking closed, water in the fuel, a restricted gas cap vent, or a lean fuel mixture. When it cuts out, you need to IMMEDIATELY check for the presence of a strong spark to the plug. ....Pull the lead off the sparkplug, and the spark should jump a gap (to a good ground) of at least 1/8" with a sharp blue spark. ....If there is no spark present, your problem lies in the ignition system. You can also hold the sparkplug lead away from the terminal of the sparkplug while the engine is running. .....Again, a strong blue spark should be able to jump a distance of at least 1/8" (1/4" is better). ....If the spark falters, or is a pale yellow spark, your ignition is not up to par. A faulty ignition coil usually fails after running approx 15-20 minutes, and will not restart until the coil has had a chance to cool down. A bad condenser, oil-soaked points, or a primary wire grounding, can also cause your problem.
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