hey dhall,my first bike was a SL100 73,,before that we found at the dump one of those reel type mowers where you pull the cone clutch in and it drives,we rigged up a motor with angle iron and tacked a board to stand on the back with wheels nailed on,we ran the drive chain bypassing the reduction,it did about 20 miles an hour,,it was great for a whole weekend untill the cast iron drive drum shattered,,we were riding it all around the neighbourhood on tar roads,what a racket!!we were 13 or 14,,what do kids do these days?