Topar Racing YZC-001 YAMAHA CaseSaver Countershaft Guard 2000-2019 YZ250, 450 2001-2004 YZ250F 2017-2019 YZ250X CASE SAVER - COUNTERSHAFT GUARD, CNC MACHINED BILLET ALUMINUM Superior appearance and unsurpassed protection for your Crankcase. Replace the weak plastic sprocket guard that came on the bike from the factory.