5.02. Petcocks

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Types of Petcocks

The type of petcock is different depending on the model year of the bike. Earlier bikes were equipped with two petcocks, one on each side. Later models have single, vacuum petcocks located on the left side.

The following picture shows a vacuum petcock from a 1981 XS650SH:


Vacuum Petcocks

Vacuum petcocks on late model XS650s have three settings:

  • RES (Reserve)
  • ON (Fuel will flow when engine is running, and stop when engine is not running)
  • PRI (Prime - fuel flows to the carburetors directly)


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