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What would be the smallest gear ratio you would advise for an 18hp motor? I'm looking for maximum speed I was thinking maybe 3:1...Is this too small?

So ive installed an 18hp motor onto an old yerf dog 3002 that used the Tecumseh 6.5hp. im needing to build transmision to handle the torque from this powerful engine. The original trans was a 30 series comet torque converter but im thinking of switching to a centrifugal clutch to avoid using a...