Engine

Designed to work with X2 or Xceldyne premium full-race components Increases flow over stock valves. VALVE IN YZ250F OUT 02-13

CNC-machined from 8620 steel Industry first color coded, purpose-built intake-sized and exhaust-sized design Design allows keepers to stay locked at higher rpm. VALVE LOCKS RMZ450

CNC-machined from 8620 steel Industry first color coded, purpose-built intake-sized and exhaust-sized design Design allows keepers to stay locked at higher rpm. VALVE LOCKS CRF450

CNC-machined from 8620 steel Industry first color coded, purpose-built intake-sized and exhaust-sized design Design allows keepers to stay locked at higher rpm. VALVE LOCKS CRF250/450F

CNC-machined from 8620 steel Industry first color coded, purpose-built intake-sized and exhaust-sized design Design allows keepers to stay locked at higher rpm. VALVE LOCKS EXH KX250F

Highest tolerances for correct valve stem support and fitment in cylinder head Built from Xceldyne's specified blend of Manganese-bronze Heat dissipation (thermal conductivity) and valve stem lubrication are substantially increased, which leads to...

Made from premium Viton material and offers superior oil control Exhibit the least amount of parasitic drag and wear on the valve, giving greater life of the valve and better power Fit OE valve and valve guide dimensions for many applications. VALVE SEAL...

Made from premium Viton material and offers superior oil control Exhibit the least amount of parasitic drag and wear on the valve, giving greater life of the valve and better power Fit OE valve and valve guide dimensions for many applications. VALVE SEAL...

Will meet or exceed OEM performance Trued to OEM specifications Multi-cylinder applications include main bearings Rebuildable Ready for installation For 2-stroke models. Kit includes crankshaft, all required roller bearings, inner seals (if necessary),...

Will meet or exceed OEM performance Trued to OEM specifications Multi-cylinder applications include main bearings Rebuildable Ready for installation For 2-stroke models. Kit includes crankshaft, all required roller bearings, inner seals (if necessary),...

Will meet or exceed OEM performance Trued to OEM specifications Multi-cylinder applications include main bearings Rebuildable Ready for installation For 2-stroke models. Kit includes crankshaft, all required roller bearings, inner seals (if necessary),...

Will meet or exceed OEM performance Trued to OEM specifications Multi-cylinder applications include main bearings Rebuildable Ready for installation For 2-stroke models. Kit includes crankshaft, all required roller bearings, inner seals (if necessary),...