All spare crankshaft bearings, reinforced or original type for your quad YAMAHA RAPTOR, YFM, GRIZZLY, WARRIOR,... are available on our shop. We strongly advise you to change your bearings every time you disassemble them. This part doesn't wear out much but it would be annoying to have to disassemble everything again for a small and cheap part. Our bearings brand HOT RODS, PROX or other are of very good quality and they have proven themselves over time