Fuel is pulled through a "straw" inside the tank. When the fuel level drops below the top of this straw, the engine will stumble, signaling you are low on gas.
On older or carbureted bikes, the petcock is a manual switch with three primary settings: motorcycle big cock
This setting pulls fuel from the very bottom of the tank, giving you a few extra miles to reach a gas station. Fuel is pulled through a "straw" inside the tank
Beyond fuel management, riding a "big" or heavy motorcycle requires specific techniques to stay safe: the engine will stumble
Completely stops fuel flow. This is used when the bike is parked for long periods to prevent fuel leaks into the engine. Important Safety and Maintenance Tips