How to convert a Vertical Shaft Lawn Mower engine into a Go-Kart engine?

there are different ways of doing that, one way is too use a peerless brand 5 speed trany but the output is slow and gearing it to the rear axle is often an issue. you would need a big sprocket on the trany out put and a small one on the axle. my friend did this with a smaller mower engine. im umeing you have the twin cylinder briggs but, depending on what oiling system it has you may be able to run it horizontal with mods to the oiling and the carb intake but i don't actually know. you might consider just tradeing/selling your engine to buy an easier one to use. if its in good shape it might be worth the price of a new or good used engine. you would probably want a big kart for an engine that size, maybe a smaller one would suit better anyways but thats up to you. if you can use a horizontal engine a belt drive torque converter with a chain drive to the solid rear axle is a good way to go. easy to set up too, but the belt drive costs money too of course. there is no end to what you can do and how you do it but its best to stay simple. makeing a kart with a vertical shaft engine might not be worth the trouble.