1
2
3
4
5
6
7
8
9
10
ENGINE
LUBRICATION SYSTEM CHART AND DIAGRAMS
.......................................5-1
ENGINE OIL LUBRICATION CHART.........................................................5-1
LUBRICATION DIAGRAMS .......................................................................5-2
..........................................................................................5-6
REMOVING THE ENGINE .......................................................................5-10
INSTALLING THE ENGINE......................................................................5-10
INSTALLING THE EXHAUST PIPE AND MUFFLER...............................5-11
REMOVING THE CAMSHAFT .................................................................5-15
CHECKING THE CAMSHAFT..................................................................5-16
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET...........5-17
CHECKING THE TIMING CHAIN TENSIONERS.....................................5-17
CHECKING THE DECOMPRESSION SYSTEM ......................................5-17
INSTALLING THE CAMSHAFTS .............................................................5-17
...........................................................................................5-21
....................................................................5-26
REMOVING THE VALVES .......................................................................5-27
CHECKING THE VALVES AND VALVE GUIDES....................................5-28
CHECKING THE VALVE SEATS .............................................................5-29
CHECKING THE VALVE SPRINGS.........................................................5-30
CHECKING THE VALVE LIFTERS ..........................................................5-31
INSTALLING THE VALVES......................................................................5-31
...............................................................................5-33
REMOVING THE PISTON........................................................................5-34
CHECKING THE CYLINDER AND PISTON.............................................5-34
CHECKING THE PISTON RINGS............................................................5-35
CHECKING THE PISTON PIN .................................................................5-36
INSTALLING THE PISTON AND CYLINDER ..........................................5-36
........................................................................................5-41
CHECKING THE STARTER CLUTCH .....................................................5-42
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 ...