I converted 2 Mac 101 engines, one went into a 1/2 scale Cub, the other is still unused...Also worked on a West Bend 8.2 Kart engine conversion.. Both worked well, not too shaky..The West Bend turned a 22x25 about 7800 rpm....The West Bend weighed about 8 1/2 lbs. and could be made to use 3 carbs, one on each side and another on the bottom.The linkage would be a nightmare.....started easily by hand with a syncro spark module in the ignition circuit....