Washer, Plate (666)

To make sure that the oil pump is metering and delivering the correct oil to petrol ratio, a thorough and close inspection of the assembly is advisable on an annual basis.
If any of the subcomponents are corroded or degraded a simple like-for-like replacement should suffice.
If the pump itself has failed, then renewal is the only realistic way to ensure complete reliability with this critically important assembly.
Other components you may wish to consider:

6E51427601
9169030016
6R54123700
6R51320010
6R51320011
7162444400
1YU1318700
9321019MA7
9010906M40
6R31341600
9046511M10
9046510098
9044507M77
9044507M85
9044507M72
9044507M02
9044507MA3
6R31318310
9044507M87
9044607M48
9044507M07
9046807M02
6R31153700
6R31311700
9321013595
9020208M44
6R54124100
6H14123700
9046805M03

Add as many items as you wish to the same shopping cart, new gaskets for example, and still only pay the same single fixed price shipping cost.

Please be aware that this component may have other applications within the Yamaha model range. So ensure the part-numbers you order are correct for your model.