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Join Date: Jan 2011
Location: Smack in the middle of Illinois
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Try a new spark plug first and a new spark plug cap second - since it runs it's not likely the CDI unit, tests on the stator require a peak voltage tester
You need to determine if it is losing spark or is a fuel issue - a pinched fuel line, clogged fuel tank vent, clogged float bowl vents or a defective petcock would restrict fuel flow - it would start and run till the float bowl emptied and then sputter and die - after a minute or two, the fuel would partially fill the bowl again and it would start and run a short time and die again.
Remove the fuel tank and connect a portable fuel supply to the carb, connect a timing light or spark tester to the spark plug wire, start the engine and see if the spark gets intermittent - if the spark is steady, then it may be a fuel problem - if it runs fine on the portable fuel supply, then find out why fuel is not getting from the tank to the carb.
Let me know what you determine.