Yamaha DRAG STAR XVS650 (1997) [199/360] Air induction system ais

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AIR INDUCTION SYSTEM AIS CARB AIR INDUCTION SYSTEM AIS AIR INJECTION This system burns the unburned exhaust gases by injecting fresh air secondary air at the exhaust port This is to reduce the output of the hydrocarbons When there is negative pressure around the exhaust port the reed valve opens and the secondary air flows into the exhaust port The required temperature for burning the unburned exhaust gases is approximately 600 to 700 C AIR CUT OFF VALVE The air cut off valve is operated by intake gas pressure through the diaphragm Nor mally this valve is opened in order to allow fresh air to flow into the exhaust port When the throttle is rapidly closed nega tive pressure is generated and the valve closes in order to prevent after burning VIEW 1 NO FLOW When decelerating the throttle closes the valve will close VIEW 2 FLOW During normal operation the valve is open A From the air filter B To the reed valve To the carburetor joint 5 10

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