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S&S CYCLE 128" Big Bore Cylinder Kit - Black Granite with Highlighted Fins - For 114"/117" Engine - M8 910-0733 Yamaha YFZ450 2004 Beta REV3 250 2008128" Big Bore Cylinder Kit Black Granite with Highlighted Fins For 114" 117" Engine M8 Big Bore kit yields excellent results with stock cylinder heads, Easy installation no need to bore or split existing cases, just swap the cylinders (unless otherwise noted), Cylinders are constructed from premium aluminum castings with cast in iron liners, Kit includes cylinders, pistons, rings and gaskets (head, base and exhaust), Made in the USA, Project requires