How can I achieve speeds of 4km/hr for a machine running on a small engine like honda gk120?

I want to build a machine that runs max speed of 5km/hr or 4km/hr… Is that possible with the engine honda gk120. Which gears should i use.

You need to specify the wheel size of your machine. A wheel 50 cm in diameter will revolve about 640 times in the course of 1km. 4km/h will equate to 640 x 4 / 60 = about 40rpm. If the engine is running at 2400rpm, the gearbox ratio will be 2400:40 = 60:1

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