jack shaft ratio help

[kennewayne]

need help figuring out the gear ratio on my kart. I havent counted teeth yet, just wondering if someone has a formula for calculating ratio of a cart with jackshaft. my jack shaft has a small and a large sprocket. seems like the ones i have seen have two sprockets that are similar to each other.

[oldkart]

I am no expert by any means but my research has provided this formula.
(x divided by x) multiplied by (x divided by x). or (10T divided by say 30T)1.3 times (10T divided by 60T)1.6 =1to18 ratio.
my final ratio on a two seater will be 19 to 1. not a lot of speed but lots of torque.
Hope this helps.