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Air cut off circuit on FCR???

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I installed a WR450F carb on my z400, and I noticed that mine has the air cut off circuit on it, where most other carb swaps I have seen don't. What exactly does it do? Do I need it? and Can I get rid of it if its more bad then good?


Edit: looking through alot of post, I am not sure if its the AIS or coast enricher....

Here is a pic, and I am talking about the diaphram right in the middle of the carb...


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