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2022-2023 Yamaha YZ450FX
New race-derived stiffer Lyocell structure used in sizes 190/55ZR17 and above
and reduced distortion
Cannot be used with bar end-mounted handguards
Pro-X 28.SIS2444-2 Valve and Spring Kit electrical-turn-signals-components-flash-controllers 2022-2023 Yamaha YZ450FXReplaces the OEM valves and valve springs. Steel, nitrided valves for increased durability and less wear under extreme conditions. Stronger valve springs deal with the extra weight of the steel valves. Springs are made from premium chrome vanadium steel for higher performance and durability at high rpm. Kit contains a set of steel intake or exhaust valves plus a set of specially designed valve springs; can be installed using the OEM retainers, bases
