Hi, I had a 38cc poulan engine on my plane, but it did not pulled enough, I decided to change it for a 46cc (Scott Ellingson engines), now the plane flights very good., but the another problem that I found with these engines is that they need a lot spin to fire it up. I was using my drill but if it did not fire up by the 1st or 3rd time the battery would die , I was thinking to install an electronic ignition that way it would be easier to fire it up, but it costs >$100, I decided to install a pulley, I put it at the front of the prop, now I pull the rope 3 or 4 times and now it fires up.
Maybe in the future, I'm going to install the electronic ignition.
here is the picture of my pulley.