I converted a Homelite 25cc and could start it with my normal electric start. It actually cranked it over rather easily.

Later I used a converted Homelite 30cc and the starter could barely pop it over TDC. I eventually bought a helo sized started than another club member was using on his DZY 48cc engine. It's far better but still struggles with that first pass over TDC.....which could be attributable to the 3 year old 7A SLA battery I use.

BTW if you have a magneto engine, you need to spin the engine at a decent speed to get that ignition firing. You'll notice all the 'hand prop' starts are with electronic ignition equipped engines.