Think I might have a whole spare engine with gearbox for one of those (NOS). That's the only engine I ever remember seeing with a purple decal on the recoil blower housing. Is the decal on the engine cover purple?
Never got around to it but I was going to make one out of EMT pipe.
It may be the gearbox that's stuck and not the engine. The old grease they used in them can get hard as a rock