Originally Posted by FFV8
Experience tells me that with no pedals you will need a 14:1 overall ratio with a 79cc engine.
Pedals are not needed here in NV either. Without pedals, it must launch on the clutch. I have seen various ratios tried within our group, and one guy has to flintstone launch the bike at every stoplight - I think he is at 10:1
Using a Hilliard Extreme Duty clutch with the 3000 rpm springs installed helps a lot. You can at least get the engine up on it's torque peak at launch.
Here are some pics of the bikes with various jackshaft arrangements:
All of those 79's are running a PZ19 style carb of one kind or another, and they will all hit 6200 rpm
So to hit a 14:1 ratio, what size sprockets do i need for clutch, jackshaft in, and jackshaft out, assuming a 28 tooth rear sprocket?