Simply take the clutch cover off and rotate the flywheel. Remove the spark plug to make that easy. Compare the flywheel rotations with the clutch rotations. I estimate 2:1. Please correct me if I am wrong. TIA.
The old Mac saws back then also had gear reduction. They looked like snails cutting wood the last I saw one do it. Regardless, they got the job done. Heck, it might have even been 3:1. Engineers back then thought torque was more important than RPM.