Yamaha YZ250FM 2021 Owner's Service Manual

ENGINE SPECIFICATIONS2-2EAM20128ENGINE SPECIFICATIONSEngineCombustion cycle 4-strokeCooling system Liquid cooledValve train DOHCDisplacement 250 cm³Number of cylinders Single cylinderBore  stroke 77.0  53.6 mm (3.03  2.11 in)Compression ratio 13.8 : 1Starting system Electric starterFuelRecommended fuel Premium unleaded gasoline (E10 acceptable)Fuel tank capacity 6.2 L (1.6 US gal, 1.4 Imp.gal)Engine oilRecommended brand YAMALUBESAE viscosity grades 10W-40, 10W-50, 15W-40, 20W-40 or 20W-50Recommended engine oil grade API service SG type or higher, JASO standardMALubrication system Wet sumpEngine oil quantityOil change 0.73 L (0.77 US qt, 0.64 Imp.qt)With oil filter removal 0.75 L (0.79 US qt, 0.66 Imp.qt)Quantity (disassembled) 0.95 L (1.00 US qt, 0.84 Imp.qt)Oil filterOil filter type CartridgeCooling systemCoolant quantityRadiator (including all routes) 0.93 L (0.98 US qt, 0.82 Imp.qt)Radiator cap valve opening pressure 107.9–137.3 kPa (1.08–1.37 kgf/cm², 15.6–19.9psi)Spark plug(s)Manufacturer/model NGK/LMAR9E-JSpark plug gap 0.6–0.7 mm (0.024–0.028 in)Cylinder headWarpage limit 0.05 mm (0.0020 in)CamshaftCamshaft cap inside diameter 22.000–22.021 mm (0.8661–0.8670 in)Camshaft journal diameter 21.959–21.972 mm (0.8645–0.8650 in)Camshaft-journal-to-camshaft-cap clearance 0.028–0.062 mm (0.0011–0.0024 in)Camshaft-journal-to-camshaft-cap clearancelimit0.080 mm (0.0032 in)Camshaft lobe dimensionsLobe height limit (Intake) 32.130 mm (1.2650 in)Lobe height limit (Exhaust) 33.460 mm (1.3173 in)Valve, valve seat, valve guideValve clearance (cold)Intake 0.12–0.19 mm (0.0047–0.0075 in)Exhaust 0.17–0.24 mm (0.0067–0.0094 in)