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Acerbis Chain Guide Block 2.0 Black for Yamaha YZ450F/YZ250F 4-Stroke/YZ450FX Product Details Acerbis' Chain Guide Block 2.0 easily replaces the entire OEM chain guide unit and ensures durability and high resistance to shock and wear from the chain. Fabricated from PA6 polyamide resin, the block is made of two parts that allow simple installation without removing the chain. Built on the success of Acerbis' original Chain Block, their engineers went back to the drawing board to create a completel...

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