You shouldnt need to have it on a base to set the timing, As above I also use a screwdriver or something similar to get the engine to TDC, then turn the crank anticlockwise until its 3mm before TDC (its best to have the points, coil stator plate loosely fitted for this), then without spinning the crank adjust the points so they are just starting to open and tighten the screws down.

Newer powertorque motors are chea and nasty peices of crap, chinese bearings, chinese casting, nasty nasty nasty. The older ones wear a bit quicker as the crank is only supported at one end, however I still like them, they have always been my best seller, though one day times will change when briggs decides to end the victa 2 stroke and noone will have a 2 stroke mower at all anymore.