As with all flexible, pliant plastic these items can degrade and go brittle over the years, reducing the effectiveness of allowing air only from the air filter to enter the carburetors. If you need to replace one, you probably need to replace them all. You may like to check the CB750K7, K8; F1 and F2 series 'parts list' fiche's, you might be surprised just how many parts are still available for these machines!
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