It's not as simple as you might think to build a go-kart with an old lawnmower motor. Because karts and lawnmowers are made differently, this is why it can be difficult to build a go-kart. You will need to adapt a mower engine to work with it. You can purchase a berg pedal karts for grown-up once you have done this.
Vertical shafts are a feature of lawnmower engines. You can't simply flip them over to make them go-kart-ready. The oil inside them won't circulate properly and it would be impossible to convert them. A gearbox is required to convert your motor from one that can be used in a go-kart. This job is not for the faint-hearted.
This is how to convert a lawnmower engine so it will work with a go-kart. You will need to attach a gear to the engine's bottom. This will allow the gear to turn the axle. If you are like me, this is something you would not know how to do.
However, if you have some mechanical skills or a friend who understands engines, this step should be easy. You will need bevel gears and a lever to disengage them.
You'll find conflicting information online if you search for information about converting a mower into a go-kart. You might find that the advice of one person contradicts what another tells you. While one website recommends the above method, others say it won't work. If you don't have the basic mechanic skills or are a keen amateur who likes to experiment and discover new things, it is best to get professional help or buy a pre-built go-kart.