Yamaha YZ250X 2023 Owner's Manual

MAINTENANCE INTERVALS3-1EAM20157MAINTENANCE INTERVALSEAM30369MAINTENANCE INTERVALSNOTICEECA25871• After a break-in or before each race, always check the points shown in “TORQUE-CHECKPOINTS” for tightening torques and retighten them.• Periodic inspection is essential in making full use of the machine performance. The life ofparts varies significantly according to the environment in which the machine runs (e.g., rain,dirt, etc.). Therefore, earlier inspection is required by reference to the list below.TIPItems marked with an asterisk should be performed by a Yamaha dealer as they require special tools,data and technical skills.No. Item Routine Afterbreak-inEveryrace(about 2.5hours)Everythird race(about 7.5hours)Everyfifth race(about 12.5hours)Asrequired1 * Piston• Check piston for carbon depositsand cracks or damage.• Clean. • Replace.  2 * Piston rings• Check piston ring end gap andrings for damage.  • Replace.  3 * Piston pin and smallend bearing• Check piston pin and small endbearing for damage. • Replace. 4 * Cylinder head• Check cylinder head for carbondeposits.• Clean. • Check cylinder head gasket fordamage.• Tighten cylinder head nuts if nec-essary. • Replace cylinder head gasket. 5 * Cylinder• Check cylinder for score marks orwear.• Clean. • Replace. 6 * YPVS• Check YPVS for carbon depositsand cracks or damage.  • Clean.  7 * Clutch• Check clutch housing, frictionplates, clutch plates and clutchsprings for wear or damage.• Adjust. • Replace. 8 * Transmission• Change the transmission oil.  • Check transmission for damage. • Replace bearings. 9 * Shift forks, guidebars, shift cam• Check all parts for wear and dam-age.• Replace if necessary.