The stock yerf rear axle comes with a 31 tooth sprocket and a fixed welded hub. so you might have a hard time getting the chain to line up. Getting another axle sprocket will require having something custom made for the bolt pattern. Axle diameter is 1 & 1/4" [ plus or minus] at the frame bearing positions. It takes a 1&1/4" inner dia. bearing.
For speed, go down on the tooth count of the axle sprocket. For every tooth on the counter sprocket, going 2 teeth, up or down, on the axle sprocket changes the final drive ratio by an average of 10%. Lower axle sprocket count = speed. Higher count on counter sprocket = torque. Do a search on line for gear ratio charts. There are a ton of them out there. Depending on your needs, something around 1/50 to 2/00 final drive will give a fairly good balance of speed plus enough torque to get the cart rolling without overheating the clutch. A ratio higher will give good top speed but it will take a mile straight to reach top speed.
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