- Big Bore Kit
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18 19 Yamaha YZ450F YZ 450F 102mm 500cc Athena Big Bore Kit 13.51 CP Piston
Athena / CP Carrillo / AZ Quad Parts Conglomerate Kit. 102mm 500cc Big Bore Cylinder Top End Kit! This Is The Best Big Bore Kit On The Market! Fits Yamaha YZ450F Dirt Bike Models Years 2018 And 2019 ONLY. Fits Yamaha YZ450FX Dirt Bike Models Years 2019 And 2020 ONLY.
102mm 500cc Nikasil Athena Big Bore Cylinder. Larger Water Jackets Keep Your Motor Cooler! CP Carrillo Piston Kit (Includes, Piston, Pin, Rings & Clips). 13.5:1 Compression Ratio (Race Gas ONLY). Athena Complete Top End Gasket Set.
Must be installed by a qualified professional and dyno tuned for proper AFR. We highly recommend this kit be used with a Carrillo rod and a properly built crankshaft.