Welcome- What type/size motor? Any suspension on this kart? Also your wieght will be a big factor on if the centrifical clutch will last. Can you post some pic's of it?
Just to give you an idea of what you might need-
To get any type of climbing ability you'll probably need 9-10 tooth on the clutch, similar on the jackshaft & 50+ tooth on the axle.
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