The next sequence is to place your engine and drive train system in place. At the same time put your seat in position to make sure the seat and engine are not hitting each other. Be sure to make the seat removable so that you can actually work on the engine system when needed.
When placing your engine typically a plate is needed to hold the engine onto the frame. Some designers use tubes with holes drilled in them for engine placement. I prefer the plate option, because it gives me greater options as far as engine choices in the future.
For example on the Phi-Alpha-10 and the Phi-Alpha-9 (go karts I designed) the engine plate served well in allowing me to use different engines, whether Briggs and Stratton, Tecumseh or even Honda. All engine types could be easily mounted just by drilling the holes in the motor mount plate.
Most go karts use a slot system to keep the chain tight. In other words, the engine is mounted not using holes but slots. That works, but honestly, drilling slots is intensive works and requires some patience and thought. So I prefer tensioning the chain, it works better on multiple fronts. (I can go on and on about engines, drive trains and such...but we have got to keep moving here...)
A word about drive systems: A live axle system is really the way to go. All you have to do is mount two bearing brackets and away you go. On a one wheel drive system, you need to have special rims that contain bearings, special drive sprockets that connect to the tires, and the axle if it gets bent, you have to cut it out of the frame and start over....so use a live axle...
But, that is not all true. You can get away with using old lawnmower wheels if they have bushings in them. They work great for acting as bearings. Grease snot out of the axel-hub interface and away you go. Be sure to retain the wheel with a cross bolt that is at least grade 5.
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