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Motorcycle Glossary Dictionary Term - Petcock

Petcock: A petcock is a manually operated device inserted in the gas line that allows for an On, Off, and Reserve position for the gas supply. When the motorcycle starts to sputter, the rider turns the petcock to the Reserve position to gain access to additional gas while a gas station is sought. Some modern motorcycles have gas gauges and automatic gas shutoff systems making the manual petcock unnecessary.

Here's a good reference on Gas Tanks that also discusses all the types of Petcocks. It discusses ON-OFF-RES, ON-RES-PRI, and ON-OFF systems: Gas Tanks

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