I've had a little experience with that (I'm referring to the Weed Eater Outboard not the Chainsaw Motorcycle. I use a 4.25 inch prop on 25cc which...
Well, I sell a Kit for $100, the kit has the motor mount, propeller, and various other parts required for the conversion, the completed unit is...
I also looked around for a weed eater outboard, but did not find anything I liked. So about 5 months ago (April, 2013), I decided to build my own....