TROUBLESHOOTING
9-6
EAM30511
TROUBLESHOOTING OF TRANSMISSION
Symptom
Possible cause
Actions
Difficult or impossible to shift
transmission gear
Clutch drags
Refer to “Clutch drags”.
Improperly adjusted shift rod
Adjust the shift rod installation
length.
Bent shift shaft
Replace the shift shaft.
Foreign object in a shift drum
groove
Remove foreign object from shift
drum groove.
Damaged shift drum
Replace the shift drum.
Seized shift fork
Replace the shift fork and shift fork
guide bar as a set.
Bent shift fork guide bar
Replace the shift fork guide bar.
Foreign object between transmis-
sion gears
Remove foreign object from trans-
mission gears.
Seized transmission gear
Replace the seized gear and the
axle as a set.
Improperly assembled transmis-
sion
Reassemble the transmission axle
assembly.
Jumps out of gear
Incorrect shift pedal position
Adjust the shift pedal position.
Improperly returned stopper lever
Replace the stopper lever spring.
Bent or worn shift fork
Replace the shift fork.
Shift drum incorrect axial play
Replace the shift drum.
Worn shift drum groove
Replace the shift drum.
Worn transmission gear dog
Replace the transmission gear.
Transmission noise
Damaged or worn transmission
gear
Replace the transmission gear.
Worn main axle spline
Replace the main axle.
Worn drive axle spline
Replace the drive axle.
Worn bearing
Replace the bearing.
Summary of Contents for YZ450F 2021
Page 6: ...EAM20162 YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY ...
Page 10: ......
Page 44: ...MOTORCYCLE CARE AND STORAGE 1 32 ...
Page 61: ...TIGHTENING TORQUES 2 16 ...
Page 62: ...CABLE ROUTING DIAGRAM 2 17 EAM20152 CABLE ROUTING DIAGRAM Frame and engine left side view ...
Page 64: ...CABLE ROUTING DIAGRAM 2 19 Frame and engine right side view ...
Page 66: ...CABLE ROUTING DIAGRAM 2 21 Handlebar front view ...
Page 68: ...CABLE ROUTING DIAGRAM 2 23 Frame and engine top view ...
Page 70: ...CABLE ROUTING DIAGRAM 2 25 Frame and battery top view ...
Page 72: ...CABLE ROUTING DIAGRAM 2 27 Rear brake right side view ...
Page 74: ...CABLE ROUTING DIAGRAM 2 29 ...
Page 112: ...ELECTRICAL SYSTEM 3 36 ...
Page 148: ...REAR BRAKE 4 34 system Refer to BLEEDING THE HYDRAULIC BRAKE SYSTEM on page 3 25 ...
Page 189: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 3 1 Connecting rod 2 Oil nozzle 3 Crankshaft ...
Page 191: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 5 1 Oil filter element 2 Oil pump 3 Oil strainer ...
Page 262: ...TRANSMISSION 5 76 ...
Page 272: ...WATER PUMP 6 9 ...
Page 282: ...THROTTLE BODY 7 9 ...
Page 289: ...IGNITION SYSTEM 8 6 ...
Page 290: ...ELECTRIC STARTING SYSTEM 8 7 EAM20143 ELECTRIC STARTING SYSTEM EAM30279 CIRCUIT DIAGRAM ...
Page 294: ...CHARGING SYSTEM 8 11 EAM20144 CHARGING SYSTEM EAM30282 CIRCUIT DIAGRAM ...
Page 297: ...CHARGING SYSTEM 8 14 ...
Page 298: ...FUEL INJECTION SYSTEM 8 15 EAM20145 FUEL INJECTION SYSTEM EAM30284 CIRCUIT DIAGRAM ...
Page 321: ...FUEL INJECTION SYSTEM 8 38 ...
Page 322: ...FUEL PUMP SYSTEM 8 39 EAM20146 FUEL PUMP SYSTEM EAM30287 CIRCUIT DIAGRAM ...
Page 352: ...SELF DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE 9 15 ...
Page 362: ...CHASSIS 10 9 ...
Page 364: ......
Page 366: ......
Page 368: ...YZ450FM 2021 WIRING DIAGRAM B2W 2819U 11_W D indd 2 2020 02 05 10 21 39 ...