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Originally Posted by
JMC
DISCLAIMER: YOU DO THIS AT YOUR OWN RISK AND MAY VOID THE MANUFACTURERS WARRANTY.
AIS Removal/ Disable:
To disable the AIS all you need to do is disconnect the blue plug that comes out of the top of the pump which is located behind the horn.
Unfortunately the only way to do this is to remove the seat, side panels, tank panels and then unbolt the tank. Instructions for removing the panels can be found in your Yamaha owner�s manual.
Do not disconnect the fuel lines to the tank, you should be able to slide the tank far enough back to give you access to the pump.
Disconnect the blue connector, i used some electrical tape and taped over the exposed connector on the pump. Then I used some Vaseline and covered the end of the connector
DISCLAIMER: YOU DO THIS AT YOUR OWN RISK AND MAY VOID THE MANUFACTURERS WARRANTY.
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A BIT OF BACK ROUND
AIS :air induction system burns unburned exhaust gases by injecting fresh air into the exhaust port , reducing the emission of hydrocarbons.
When there is negative pressure at the exhaust port the reed valve opens allowing secondary air to flow into the exhaust port.
The system also has an cut off valve that is controlled by the signals from the ECU.The cut off valve opens to allow the air to flow during idle and closes to cut off the flow when the moto is being driven.
However,if the coolant temperature is below the specified value the valve remains open and allows the air to flow into the exhaust pipe until the temperature becomes higher than the specified value.
Also if you unplug the AIS there is a mechanical function as well, where it drags in air when there is a vacum in the exhaust. e.g. on R1 and other yam bikes they disconnect the hoses and block the holes.