Got a Ryobi 31 with about 6 hours total and it is a real pain to start. 2 ring piston, head with the relief slot. Factory ignition. I'm using a Tower HD starter, 4' 16ga wire leads factory, Yaesu 14 amp bat, (freshly charged. When engine is cold the only way it will turn it over is to loosen the plug several turns, once started and run for a few minutes, if your quick you can shut it down, tighten plug and it will restart nicely with starter. Othertimes it wil just not turn past TDC.

I dislike tightening the plug with the engine running. This is the only method that is fool proof to get it to stay running. Still have all fingers and have shortened the wrench handle to be somewhat safer. There has to be a better way

Fellow at field witnessed this and we tried his battery and starter to no avail. They were impressed with the weedie conversion but the starting method sucks....