The engine is a Honda 5.5hp, gx160. My current gear setup is pieced together just to make things work with the few parts I have. Let's see here....the clutch is 12t #35 to a 12t #35 on the jackshaft (1), then a 10t #40 on the jackshaft (2) to a 70t #40 on the axle.
The #40/#41/#420 are still unfamiliar to me, so I'm not sure what number in that family all my 4x stuff is - everything fits, so I went with it.
Basically, I had a #35 driver sprocket on my clutch and #4x driven sprocket on my axle.