Uncle Lee,
I had a Jake turbo-cut 21", it wasn't the commercial model. Mine had the top pull starter not the side pull like yours. Jacobsen built a very good two stroke (albeit on the small side of 102cc). The turbo-cut had a unique blade, a round stamped steel disc with four blades bolted to it. It did an outstanding job vs a blade with two cutting surfaces. Jacobsen made a 321 and 501 engine, the 321 standing for 32:1 oil mix and 501 standing for 50:1 oil mix. The engines were identical except for the bearings (I think). My Jake started on the first pull every time. My turbo-cut was a push mower, I don't think they offered self propelled on their 2 stroke models, but you could get the exact same mower with a 4 cycle engine, that model I think you could get as self propelled.
Jeff