Triumph Speed Triple Service Manual page 255

Fuel SystemlEngine Management
Evaporative Control System
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Engine Running
When the engine is started, a vacuum is applied via pipe A to a vent valve on the canister, causing it to open.
Simultaneously, vacuum is applied along pipe B, via the purge control valve to the canister vent port.
Because the.vent valve has been opened, the vacuum applied at point B begins to draw stored vapour from the
carbon filled area of the canister via the vent port and returns it to the throttle bodies for burning in the engine.
In order to control the speed at which vapour is purged from the canister, the engine management system
regularly shuttles the purge control valve between open and closed positions.
Carbon
Service Manual
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Speed Triple