Timing is pretty important....yes you have to set it. Incorrect timing can cause the popping. So will a cold engine. You have to have it at operating temperature before gunning her. emember that these are not like todays computer regulated cars, where the fuel/air mixture is automatically controlled based on a series of inputs.
Is the hose hooked up from the aircleaner to the carb? Any possibility you have the aircleaner overfilled with oil? This will be the same as having the choke on.
Winter has set in full force here....lots of snow and -20 temps. So I am buggering off to Cuba tomorrow. Looking forward to seeing how this turns out in a week when I get back.
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