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Speed mostly depends on three factors, engine RPM, tire size, and gear ratio. So that question is not easily answered. Most 5-7 hp yard go-karts go 17-35 mph, with 25 mph being common. 8-13 hp go-karts with torque converters and large tires top out at around 40 mph. Race karts can go much faster as they use modified or two stroke engines that rev higher, so you could see speeds of 50-60 mph in those. Enduro and high end race karts can go much much faster.

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