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While changing the front sprocket its always recommended to inspect the countershaft oil seal thats right behind the sprocket. Positioned on the high loaded countershaft and always in contact with dirt and water the oil seal can easily start leaking. ProX has developed a wide range of countershaft seal kits. These kits are an easy and complete replacement offering all the needed components and at the same time it is an upgrade kit resulting in improved durability against the. This item fits the following vehicle applications: compatible with Gas Gas EC 250 F 2013-2015 compatible with Gas Gas EC 300 F 2013-2015 compatible with Yamaha WR250F 2011-2013 compatible with Yamaha WR250F 2001-2009 compatible with Yamaha YZ250F 2001-2013