i had an old red razor pocket rocket that you get at walmart for like 120$ that i got for free and my mom brought home 2 weed eaters that the lady that owned them said the couldnt get them to work and well i got them both running it 10 mins and i put a feather lite engine not sure of cc on the pocket rocket with a friction drive and its fun goes around 40 mph its really fun ill get some pics tomorow xD!!!!