E50 will not start...... (1 reply)

I have an E50 with a 65cc Hero kit, 16mm PHBG and MIM pipe. Spark is good, NKG B6HS, carb has 74, 60, 48, float is at 16.5. New gas, 50/1. Plug gets wet in time. It ran for 15-20 seconds, then poped back through the carb and now nothing? I have not changed a thing. My HF compression gage says 60lbs. (I dont trust it, but.....). I bought it used on the buy/sell and was told it ran and had little time on it. Any ideas????
Thanks!