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650R Intake manifold restriction, why?

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Xr's only sells one with no restriction, so I am going to cut it out tomorrow. Also, what is the little spring-loaded diaphragm for on the left side of the carb body?

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I cut the restriction window out of the manifold with a pneumatic saw and a die grinder today. I read up on the air cutoff valve, and I plan to leave mine in.

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Have look HERE. It is the other things you could do to uncork it. Not sure what year your bike is but one other thing to look into is on the early year xr650r's they had clutch bushing seizure issuse that was fixed by honda at some point. You can google it for more info and if it might apply to your bike.

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