I would also check the vacuum lines from the petcock to the carb. Only if it is the original "CV" carb. If there is no vacuum line, check and make sure where the vacuum line connects to the carb that it is blocked and has a positive seal, if the original petcock was replaced with something like a "Pingle" petcock. Also clean and rebuild the carb. Pretty easy to do, but get a re-build kit for the carb for like $20.00. Remember Air, Spark, & fuel is all you need to get an internal combustion engine to run as long as the timing is set correctly.
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