What are the best lights to use for a gas powered go kart? Headlights, tail lights...that kinda thing.
Wal-Mart sells some small head lights that you can weld, bolt or glue to the front of your kart for headlights. Ask the attendant for small brake lights and connect them to the generator on the engine.
You'll need a battery also. If you just use the engine to power the lights, they will dim and brighten depending on how fast the engine is going