Air Controle Valve - Suzuki VL125 Service Manual

AIR CONTROLE VALVE

• The air control valve changes the valve opening area to adjust the air volume for slow system in accor-
dance with temperature variation, thereby supplying the optimum air/fuel mixture for idling operation.
In this system, air is taken in from the clean side of air cleaner and guided into the slow system through the
air control valve.
Air supplied both from the slow air jet and the air control valve is metered by the pilot screw to produce air/
fuel mixture most appropriate for the current atmospheric temperature, and then jetted into the main bore.
Left air
cleaner box
Air cleaner element
When temperature is low (air density being high):
• The thermo-wax inside the air control valve shrinks and the
valve opening area is narrowed due to spring force.
When temperature is high (air density being low):
• The thermo-wax inside the air control valve expands causing
the piston to push the valve resulting in widened opening area.
Spring
Air control valve
Air density being low
Pilot screw
AIR
FUEL/AIR MIXTURE
FUEL
FUEL AND LUBRICATION SYSTEM 4-7
Slow air jet
Slow jet
Valve
Piston
Air density being high