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carb air cut-off valve (TRX 350)

7173 Views 3 Replies 2 Participants Last post by  JimC
Out of curiosity, what is the function of the air cut-off valve? Am trying to remove the needle holder from the vacuum piston with no luck, Any hints? With a phillips I can turn the holder but can't get it to budge.

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The air cut off valve cuts air off when decelerating quickly, making the fuel mixture richer, to eliminate back firing.
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I had the carburator apart to replace the choke cable and I believe I left an o-ring off of the air cut off which probably explains the backfiring. Thanks for your info.
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