CIRCUIT DIAGRAM 1. Crankshaft position sensor 2. AC magneto 3. Rectifier/regulator 4. Joint connector 6. Engine ground 7. Battery 8. Frame ground 9. Fuse 14. CCU (Communication Control Unit) 15. Yamaha diagnostic tool coupler 16. ECU (Engine Control Unit) 17. Ignition coil 18. Spark plug 19. Fuel injector 20. Fuel pump 21. Intake air temperature … Read more
2. AC magneto 3. Rectifier/regulator 4. Joint connector 6. Engine ground 7. Battery 8. Frame ground 9. Fuse 16. ECU (Engine Control Unit) 20. Fuel pump 25. Engine stop switch A. Battery sub-lead B. Wire harness TROUBLESHOOTING The fuel pump fails to operate. Before troubleshooting, remove the following part(s): Seat Side cover (left/right) Air … Read more
1. Rectifier/regulator 2. Intake air pressure sensor 3. Throttle position sensor 4. Injector 5. Mode switch 6. Intake air temperature sensor 7. ECU (Engine Control Unit) 8. Ignition coil 9. CCU (Communication Control Unit) 10. Starter relay 11. Fuse 12. Battery 13. Gear position switch 14. Fuel pump 15. Coolant temperature sensor CHECKING THE … Read more
SELF-DIAGNOSTIC FUNCTION TABLE (FOR FUEL INJECTION SYSTEM) Fault code Item Page 12 Crankshaft position sensor: no normal signals are received from the crankshaft position sensor. Fault code No. 12 13 Intake air pressure sensor: open or short circuit detected. Fault code No. 13 14 Intake air pressure sensor: hose system malfunction (clogged or detached hose). … Read more
GENERAL INFORMATION Troubleshooting information provided here does not cover all the trouble symptoms, possible causes, and remedial actions. Some items may not apply depending on the model. Use this information as a guide and quick reference matrix when performing basic troubleshooting. Refer to the each chapter for detailed information on checking, adjustment, and replacement. … Read more
FRONT FORK SETTING The front fork setting should be made depending on the rider’s feeling of an actual run and the circuit conditions. The front fork setting includes the following three factors: 1.Setting of air spring characteristics Change the fork oil amount. 2.Setting of spring preload Change the spring. 3.Setting of damping force Change the … Read more
Secondary reduction ratio = Number of rear wheel sprocket teeth/Number of drive sprocket teeth Secondary reduction ratio 3.846 (50/13) <Requirement for selection of secondary gear reduction ratio> It is generally said that the secondary gear ratio should be reduced for a longer straight portion of a speed course and should be increased for a … Read more
YZ250FP 2023 Crankshaft position sensor AC magneto Rectifier/regulator Joint connector Main relay Engine ground Battery Frame ground Fuse Starter relay Starter motor Diode 1 Diode 2 CCU (Communication Control Unit) Yamaha diagnostic tool coupler ECU (Engine Control Unit) Ignition coil Spark plug Fuel injector Fuel pump Intake air temperature sensor Coolant temperature sensor Throttle … Read more
GENERAL TIGHTENING TORQUE SPECIFICATIONS This chart specifies tightening torques for standard fasteners with a standard ISO thread pitch. Tightening torque specifications for special components or assemblies are provided for each chapter of this manual. To avoid warpage, tighten multi-fastener assemblies in a crisscross pattern and progressive stages until the specified tightening torque is reached. … Read more
After a break-in, perform careful maintenance to get ready for the next practice or race. Refer to PRE-OPERATION INSPECTION AND MAINTENANCE. MAJOR MAINTENANCE 1.For the engine Leaks around the engine Check for pressure leaks from the cylinder head or the cylinder, oil leaks from the crankcase or the case cover, leaks from the coolant system, and … Read more