Replace your Mikuni HS, HSR, RS, TM, or VM series carburetor drain plug o-rings with only genuine Mikuni parts.  The Mikuni VM28/254 drain plug o-rings are made to higher standards and ensure only the best quality.  The Mikuni 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 Mikuni carburetors except for the VM singles and replaces the drain plug o-ring.  Mikuni OEM #VM28/254.  Does not fit the Mikuni VM single carburetors.  They will work with the Mikuni VM rack carburetors.

The o-ring is approximately 22.5mm OD x 19.5mm ID x 1.5mm thick.