I picked up a weedwacker featherlite 21cc and a CH ignition system. It runs a 15x6 at 8000 rpm. That is now pretty unimpressive to me. I would like to make a 7-foot span eindecker. It is looking like my little engine will not cut it. I have a Ryobi 31 cc to convert.

I will stick with the CH ignition in any case.

Should I:

1. Hop up the 21cc and see what I can wring out of it? Try a bigger carb and port it and remove as much superfluious aluminum as possible with my milling machine and lathe.
2. Do the Ryobi, port it, bigger carb lighten it as much as is reasonable.
3. Select some other engine? The CH guy like Homelites.