Well the Christmas day plans to start my newly rebuilt 235 went bust. Got real close to having it catch at first but now the more I crank the worse it seems to get, just a lot of popping back thru the carbs. Thought I was 180o out of time but that wasn't it.I'm getting fuel,compression, and spark,although I don't know if the spark I'm getting is sufficient. New coil with Pertronix modified dizzy. Any suggestions guys on where to start looking?