It could very well be the ignition. I pulled the spark plug and found a nice spark,but then when i put some gas in thru the plug hole,and reinstalled the plug, I couldn't get a pop out of it. It should have ran that charge out.
I am thinking it might be that plug cap has an intermittent connection. Its been pounded in the ground hard. I once broke the plug under it. A nice new $16 plug.
Unfortunately, I don't have a new ignition to try and don't feel like buying a new one.
I am running A123 batteries with two diodes in series to get the voltage down to 4.9. I even tried a different A123