This is a pair of Double Lipped Crankshaft Seals which fit the righthand side and lefthand side crankcases.
Yamaha YZ 125 (2005-2023) Pair Japanese KOYO Crank Shaft Main Bearings And Seals
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Yamaha YZ 125 ( 2001 2002 2003 2004 ) Pair of Crank Shaft Seals x 2pcs
Yamaha DT 125 R ( 1988 - 2003 ) Pair of Crank Shaft Seals NEW