they are made by poulan, not a hard cunversion, if staying with magneto ignition, it's not the prettiest thing as you have to leave parts of the fan schroud and cut off the rest, if going to electric ignition you can cut off the whole fan schroud and it looks more like a glow engine. I think the blowers have the long crankshaft, so the prop adapter is more of a spacer than short shaft engines...