I cant say ive noticed those cast lugs on mine.
It is possible that they are mounting lugs for a 4 stroke or even possibly a power torque motor.
Easiest way to tell is to pull a power torque off a mower, grab the metal plate that goes under the motor and lay it on the lugs to see if it lines up.
Youd have to pull the full crank off of course.
Are there 3 or 4 lugs.
The 4 strokes mount on 3 in a circle.
The power torque mounts on the same 3 but has a 4th one off set under the carb, so the same spot as the carb thats on it, is there a lug there???
You could make the SP work with a 4 stroke. Just a matter of buying a pulley the right OD, then getting the ID machined to fit the shaft and working out how you are going to make it stay on the shaft.
Youd need a 4 stroke victa crank boss, then workout the height from the one on the full crank and work out what goes where.
For unlevel or hilly terrain its hard to beat the full crank.
