Replace your Keihin carburetor o-rings with only genuine Keihin parts.  The Keihin 1099-817-2001 vacuum release plate o-rings for FCR and FCR-MX carburetors are made to higher standards and ensure only the best quality.  The Keihin o-rings are made from a rubber polymer that remains pliable even after many years of use and ensures an exact fit and proper function in all conditions.  This o-ring fits all Keihin FCR and FCR-MX carburetors using the 1099-817-2001 vacuum release plate o-ring.  Keihin OEM #1099-817-2001.


The vacuum release plate is the loose plate on the flat slide assembly that serves as sort of a vacuum valve to help regulate engine vacuum, particularly when starting.  It will also cause inconsistent idling when leaking or worn. 


All Keihin carburetor parts are available.  Please drop us a note if you have some specific items you cannot find on our website.