Another success on 9th attemp.Recharged starter battery prior to and all went well. It is really tough resisting the urge to use it as a leaf blower!!! Standing about 15 feet behind engine is like being on the tarmac at Phila. International Airport. I'm sticking with my theory about starter battery as we checked rpm before and after test run. There was a drop off so we didn't attempt another run. Maybe I'll try a 7.2 racing pack. How do you connect up the powermax can? I saw one in Dick's sports but the top is different than normal gas bottle. Doug......