0n the 5.5 HP models, the 15" shaft was standard, but they did have the optional 20" available. More than likely it's a 15". Do you have the motor. If so, you can measure it like the pic below:<br /><br /> More info and pics<br /><br />
Thank you for very fast help. No, I haven't seen the motor: I was just asked on the telephone if I wanted to have it as an gift - and the owner couldn't tell me the shaftlenght.
