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Head Air Cut Valve...what It Use For?


New Member
If we look at top of cylinder head of T135 then we should see the Air Cut Valve.
Please be kind to explain the usage of this part...Thank You


New Member
As an addition.....the Air Cut Valve is connected to black part named "Resonator" and has a hose run to air filter....well, the question add to resonator function too then hehehe



New Member

In this video, if the resonator shut by finger the engine sound become noisy and when it released the engine sound become normal again...thus the Air Cut Valve and Resonator give something essential function then?
Last edited:


Super Veteran
Other name for this is AIS. The primary function is to have cleaner or fully burn fuel emit from exhaust. It will have more air through the AIS to burn extra fuel.
Some modify bike need to remove this because it will introduce backfire.