A small go kart can be a ton of fun to drive around, but after a while, you may get bored with the slower speed a small 5 horsepower Briggs & Stratton produces. Briggs & Stratton engines run safely when you have the throttle to the max, but it is possible to make the engine even faster. The engine's speed is regulated by the governor next to the engines flywheel. When the flywheel spins too fast, the governor blows away from the flywheel and pulls the throttle down on the carburettor. Removing the governor and checking other things on the engine will make it faster.
Remove the top cover from the Briggs & Stratton engine. The cover shields the flywheel and the governor. Unscrew all of the bolts around the perimeter of the cover with the correctly sized socket. Pull the top cover off. Find the governor, which is bolted into the engine block next to the flywheel.
Unscrew the governor bolt with the correctly sized socket. Unhook the governor linkage from the eyelet on the throttle above the carburettor. Remove the governor from the engine. Without the speed-restricting governor on the engine, the engine will now run faster.
Replace the top engine cover and tighten it back into place.
Shake the muffler on the side of the engine block. A loose muffler can reduce the engine's horsepower. Tighten the two muffler bolts if they are loose with the correctly sized socket.
Unscrew the air filter cover on the side of the engine with the screwdriver. Replace the old air filter with a new one. A dirty air filter will drastically reduce the engine's horsepower. Screw the air filter cover on tightly.
Removing the governor will void the engines warranty.