its not quite a whippersnipper motor but you get a choice of 50cc and 80cc. you can get it cheaper elsewhere, at my work i think th motor kits are about $250 or $550 for the whole bike and motor assembled. after run in you get about 60 - 70 kmh outta them.
if you can mount the motor in the frame sideways and attach a sprocket to the shaft coming outta the motor, run a chain to the rear wheel sprocket, i cant see why not. probably will be gutless and you might burn out the centrifical clutch but it might be fun.
me and my dad just strapped a kawasaki whipper snipper to the side of my scooter... literally.
the engine floats around the front of the scooter... and the shaft runs to the back wheel.. and the whipper snipper head spins the wheel... goes about 30-40km/h.... not bad for a quick job!