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What is the purpose of the air valve switch on my 92 750 vulcan

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What is the purpose of the air valve switch on my 92 750 vulcan

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  1. It admits fresh air into the exhaust port through reed valves to burn unburned hydrocarbons.  It's controlled by vacuum and if it leaks, it can cause rough running.  You can remove it, plug the vacuum line and holes above the reed valves and it won't hurt anything.  I've done that on both my bikes with no ill effects.  

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