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    • Bryan Bosch

      JUST IN!   07/18/2018

      Video: 2019 Yamaha YZ250F Features & Benefits 


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About jimkay

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  1. i was replacing valves every mouth till i cut the valve seat and widened it to .060. the seat was only .030 from the factory. i also dropped the seat .010 in depth to reduce spring pressure. Just remember to grind .010 of the valve steam. The bike has raced all summer with no valve problems.