Need someone to assemble/install your engine? We have you covered! Call Mon to Fri 7am to 4pm with questions!! FITS ALL YAMAHA YFZ450 MODELS AND YEARS CARB MODEL ONLY! GET AWESOME POWER FROM THIS TOP END KIT! Full race ported and polished cylinder head (no core required). Head assembly with stainless valves, springs, seals. 95mm 12.5:1 CP piston kit. MAXLOCK Heavy duty head studs. ARP 12 point head nuts. Cometic top end gasket kit. This kit will work with and 95mm (stock bore) cylinder and stock or stroker crank. The piston uses pump or race gas. We recommend that this be installed by a qualified mechanic with experience doing this…