When the mixture of gasoline and air burns inside cylinders it could happen that not all of mixture is fully burned and some amount of gasoline exits the cylinders through exhaust pipe into atmosphere, and that makes pollution. AIS (Air Induction System) is a system for reduction of pollution i.e. emission of hydrocarbons by means to induct the fresh air into exhaust pipes forcing rest of gasoline to finish burning in exhaust pipes. The regulative of some countries require from motorcycles to have such a device in order to reduce environmental pollution.
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Yamaha xv535 Virago - 1987-1989
the exhaust without AIS |
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Yamaha xv535 Virago - from 1990
the exhaust with AIS |
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On xv535 Virago model the AIS system resides under the left side cover (#18). AIS is controlled by the vacuum (low pressure) conducted from intake manifold (vacuum is generated by piston movement). On diagram this is rubber hose #42 which is connected to front cylinder intake manifold. The rear cylinder small connector is closed with rubber cap and not used for control of AIS. The air from AIS is by smaller metal pipes (#32 and #33) conducted to front and rear exhaust pipes where afterwards burning occurs.
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| Yamaha xv535 Virago AIS components |
Yamaha AIS does have so called reed valve (#27). This valve is one way gate that allows fuel mixture to be sucked into the intake port but not get pushed back out when the piston reverses direction.
The consequence of afterwards burning is the increase of temperature in exhaust pipes and muffler. Also the backfire could occur specially during deceleration when vacuum in intake manifolds is maximal.
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Yamaha xv750 Virago - 1984-1987
the exhaust without AIS |
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Yamaha xv750 Virago - from 1988
the exhaust with AIS |
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