Keihin vacuum release plate o-rings for FCR and FCR-MX carburetors.
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.
It is made to higher standards and ensures only the best quality for an exact fit and proper function in all conditions. 

Several Keihin FCR / FCR-MX carburetor parts in stock --> Check out my other items!

A wide range of Carburetors, Carburetor parts, Vent line kits, Gasket kits, jetting components are in stock. If you don't see something you need please ask.