Sign In
Upload
Manuals
Brands
Yamaha Manuals
Motorcycle
YZ450FX 2021
Yamaha YZ450FX 2021 Manuals
Manuals and User Guides for Yamaha YZ450FX 2021. We have
1
Yamaha YZ450FX 2021 manual available for free PDF download: Owner's Service Manual
Yamaha YZ450FX 2021 Owner's Service Manual (374 pages)
Brand:
Yamaha
| Category:
Motorcycle
| Size: 23.77 MB
Table of Contents
Table of Contents
9
Safety Information
13
For Safety, be Sure to Obey the Following
13
Location of Important Labels
16
Description
17
Identification
18
Vehicle Identification Number
18
Engine Serial Number
18
Power Tuner
19
Fuel Hose Joint Cover
19
Handlebar Protector
19
Nipple Wrench
19
Included Parts
19
Important Information
21
Preparation for Removal and Disassembly
21
Replacement Parts
21
Gaskets, Oil Seals and O-Rings
21
Lock Washers/Plates and Cotter Pins
22
Bearings and Oil Seals
22
Circlips
22
Electrical System
23
Basic Service Information
23
Special Tools
27
Instrument and Control Functions
33
Warning Lights
33
Engine Stop Switch
33
Start Switch
33
Mode Switch
33
Sidestand
34
Starter Knob
34
Rear Brake Pedal
34
Front Brake Lever
34
Shift Pedal
34
Fuel Tank Cap
35
Starting and Break-In
36
Fuel
36
Starting a Cold Engine
36
Starting a Warm Engine
37
Break-In Procedures
37
Engine Starting Precaution
37
Maintenance after Break-In
38
Major Maintenance
38
Air Filter Maintenance
38
Torque-Check Points
39
Motorcycle Care and Storage
41
Care
41
Storage
42
Specifications
45
General Specifications
46
Engine Specifications
47
Chassis Specifications
52
Electrical Specifications
53
General Tightening Torque Specifications
54
Tightening Torques
54
Engine Tightening Torques
55
Chassis Tightening Torques
58
Cable Routing Diagram
62
Periodic Checks and Adjustments
75
Maintenance Intervals
77
General Inspection and Maintenance
81
Pre-Operation Inspection and Maintenance
81
Adjusting the Valve Clearance
82
Engine
82
Valve Clearance Shim Chart
85
Checking the Engine Idling Speed
87
Checking the Throttle Grip
87
Checking the Spark Plug
88
Changing the Engine Oil
89
Checking the Engine Oil Level
89
Adjusting the Clutch Lever Free Play
91
Adjusting the Clutch Lever Position
91
Cleaning the Air Filter Element
91
Checking the Fuel Line
93
Checking the Throttle Body Joint
93
Checking the Cylinder Head Breather Hose
94
Checking the Exhaust System
94
Checking the Coolant Level
96
Changing the Coolant
97
Checking the Cooling System
97
Adjusting the Front Disc Brake
99
Adjusting the Rear Disc Brake
99
Chassis
99
Checking the Brake Fluid Level
100
Checking the Front Brake Hose
100
Checking the Front Brake Pads
100
Checking the Rear Brake Pads
100
Bleeding the Hydraulic Brake System
101
Checking the Brake Operation
101
Checking the Rear Brake Hose
101
Drive Chain Slack
102
Checking and Adjusting the Steering Head
103
Lubricating the Drive Chain
103
Checking the Front Fork Legs
104
Lubricating the Steering Head
104
Adjusting the Front Fork Legs
105
Adjusting the Rear Shock Absorber Assembly
106
Checking the Rear Shock Absorber Assembly
106
Checking the Connecting Arm and Relay Arm
108
Checking the Swingarm Operation
108
Lubricating the Swingarm Pivot
108
Checking and Tightening the Spokes
109
Checking the Tires
109
Chassis
113
General Chassis
117
Installing the Air Scoop
117
Removing the Number Plate
117
Removing the Seat
117
Installing the Side Cover
118
Removing the Side Cover
118
Front Wheel
119
Assembling the Front Wheel
120
Checking the Front Wheel
120
Disassembling the Front Wheel
120
Removing the Front Wheel
120
Installing the Front Wheel
121
Checking and Replacing the Rear Wheel Sprocket
124
Checking the Rear Wheel
124
Disassembling the Rear Wheel
124
Rear Wheel
124
Removing the Rear Wheel
124
Assembling the Rear Wheel
125
Installing the Rear Wheel
125
Front Brake
128
Checking the Front Brake Disc
131
Introduction
131
Replacing the Front Brake Pads
131
Assembling the Front Brake Caliper
133
Checking the Front Brake Caliper
133
Disassembling the Front Brake Caliper
133
Removing the Front Brake Caliper
133
Installing the Front Brake Caliper
134
Assembling the Front Brake Master Cylinder
135
Checking the Front Brake Master Cylinder
135
Removing the Front Brake Master Cylinder
135
Installing the Front Brake Master Cylinder
136
Rear Brake
138
Checking the Rear Brake Disc
142
Introduction
142
Replacing the Rear Brake Pads
142
Checking the Rear Brake Caliper
144
Disassembling the Rear Brake Caliper
144
Removing the Rear Brake Caliper
144
Assembling the Rear Brake Caliper
145
Installing the Rear Brake Caliper
145
Assembling the Rear Brake Master Cylinder
146
Checking the Rear Brake Master Cylinder
146
Removing the Rear Brake Master Cylinder
146
Installing the Rear Brake Master Cylinder
147
Handlebar
149
Checking the Handlebar
150
Installing the Handlebar
150
Removing the Handlebar
150
Front Fork
155
Disassembling the Front Fork Legs
157
Removing the Front Fork Legs
157
Checking the Front Fork Legs
158
Assembling the Front Fork Legs
160
Installing the Front Fork Legs
166
Steering Head
168
Checking the Steering Head
169
Installing the Steering Head
169
Removing the Lower Bracket
169
Rear Shock Absorber Assembly
172
Checking the Rear Shock Absorber Assembly
175
Disposing of a Rear Shock Absorber
175
Handling the Rear Shock Absorber
175
Removing the Rear Shock Absorber Assembly
175
Checking the Connecting Arm and Relay Arm
176
Installing the Rear Shock Absorber Assembly
176
Installing the Relay Arm
176
Swingarm
178
Checking the Swingarm
179
Installing the Swingarm
179
Removing the Swingarm
179
Chain Drive
181
Checking the Drive Chain
182
Removing the Drive Chain
182
Checking the Drive Sprocket
183
Checking the Rear Wheel Sprocket
183
Installing the Drive Chain
183
Engine
185
Engine Oil Lubrication Chart
187
Lubrication System Chart and Diagrams
187
Lubrication Diagrams
188
Engine Removal
192
Installing the Engine
196
Removing the Engine
196
Installing the Exhaust Pipe and Muffler
197
Camshaft
199
Removing the Camshaft
201
Checking the Camshaft
202
Checking the Decompression System
203
Checking the Timing Chain and Camshaft Sprocket
203
Checking the Timing Chain Tensioners
203
Installing the Camshafts
203
Cylinder Head
206
Checking the Cylinder Head
208
Checking the Timing Chain Guide (Intake Side)
208
Installing the Cylinder Head
208
Removing the Cylinder Head
208
Removing the Valves
212
Valves and Valve Springs
212
Checking the Valves and Valve Guides
213
Checking the Valve Seats
214
Checking the Valve Springs
215
Checking the Valve Lifters
216
Installing the Valves
216
Cylinder and Piston
218
Checking the Cylinder and Piston
219
Removing the Piston
219
Checking the Piston Rings
220
Checking the Piston Pin
221
Installing the Piston and Cylinder
221
Generator
223
Checking the Generator
224
Checking the Woodruff Key
224
Installing the Generator
224
Removing the Generator
224
Starter Clutch
226
Checking the Starter Clutch
227
Electric Starter
228
Assembling the Starter Motor
230
Checking the Starter Motor
230
Checking the Clutch Boss
235
Checking the Clutch Housing
235
Checking the Clutch Plates
235
Checking the Clutch Springs
235
Checking the Friction Plates
235
Removing the Clutch
235
Checking the Pressure Plate
236
Checking the Primary Drive Gear
236
Checking the Primary Driven Gear
236
Checking the Push Lever Shaft
236
Checking the Push Rods
236
Installing the Clutch
236
Shift Shaft
240
Checking the Shift Shaft
241
Checking the Stopper Lever
241
Installing the Shift Shaft
241
Removing the Segment
241
Oil Pump
244
Assembling the Oil Pump
246
Checking the Oil Pump
246
Removing the Balancer
246
Installing the Oil Pump
247
Crankcase
249
Checking the Crankcase
251
Checking the Timing Chain Guide (Exhaust Side)
251
Disassembling the Crankcase
251
Assembling the Crankcase
252
Crankshaft and Balancer Shaft
253
Checking the Crankshaft
254
Removing the Crankshaft
254
Installing the Crankshaft
255
Transmission
256
Checking the Shift Drum Assembly
257
Checking the Shift Forks
257
Checking the Transmission
257
Removing the Transmission
257
Installing the Transmission
258
Cooling System
261
Cooling System Diagrams
262
Radiator
263
Checking the Radiator
265
Installing the Radiator
265
Water Pump
267
Assembling the Water Pump
268
Checking the Water Pump
268
Disassembling the Water Pump
268
Fuel System
271
Fuel Tank
272
Checking the Fuel Pump Body
273
Checking the Fuel Pump Operation
273
Removing the Fuel Pump
273
Removing the Fuel Tank
273
Installing the Fuel Pump
274
Installing the Fuel Tank
274
Throttle Body
275
Checking the Fuel Pressure
278
Checking the Injector
278
Checking the Throttle Body
278
Adjusting the Throttle Position Sensor
279
Electrical System
281
Circuit Diagram
284
Ignition System
284
Troubleshooting
286
Circuit Diagram
288
Electric Starting System
288
Troubleshooting
290
Charging System
292
Circuit Diagram
292
Troubleshooting
294
Circuit Diagram
296
Signaling System
296
Troubleshooting
298
Circuit Diagram
300
Fuel Injection System
300
Ecu Self-Diagnostic Function
302
Troubleshooting Method
303
Connecting the Yamaha Diagnostic Tool
304
Yamaha Diagnostic Tool
304
Troubleshooting Details (Fault Code)
306
Circuit Diagram
326
Fuel Pump System
326
Troubleshooting
328
Electrical Components
329
Checking the Switches
330
Checking the Bulbs and Bulb Sockets
332
Checking the Fuses
332
Checking and Charging the Battery
333
Checking the Relays
334
Checking the Relay Unit (Diode)
335
Checking the Ignition Spark Gap
336
Checking the Spark Plug Cap
336
Checking the Crankshaft Position Sensor
337
Checking the Ignition Coil
337
Checking the Lean Angle Sensor
338
Checking the Rectifier/Regulator
338
Checking the Starter Motor Operation
338
Checking the Stator Coil
338
Checking the Fuel Sender
339
Checking the Resistor
339
Checking the Coolant Temperature Sensor
340
Checking the Throttle Position Sensor Input Voltage
340
Checking the Gear Position Switch
341
Checking the Intake Air Temperature Sensor
341
Checking the Injector
342
Troubleshooting
343
Troubleshooting
344
TROUBLESHOOTING of ENGINE (Fault Code Not Detected)
344
Troubleshooting of Clutch
347
Troubleshooting of Transmission
349
Troubleshooting of Cooling System
350
Troubleshooting of Brake
351
Troubleshooting of Suspension
351
Troubleshooting of Steering/Handling
353
Troubleshooting of Charging System
354
Troubleshooting of Signaling System
354
Diagnostic Code: Sensor Operation Table
355
Self-Diagnostic Function and Diagnostic Code Table
355
Self-Diagnostic Function Table (for Fuel Injection System)
355
Diagnostic Code: Actuator Operation Table
357
Tuning
359
Chassis
360
Drive and Rear Wheel Sprockets Setting Parts
360
Selection of the Secondary Reduction Ratio (Sprocket)
360
Tire Pressure
360
Change in Amount and Characteristics of Fork Oil
361
Front Fork Setting
361
Setting of Spring after Replacement
361
Choosing Set Length
362
Front Fork Setting Parts
362
Rear Suspension Setting
362
Setting of Spring after Replacement
363
Rear Shock Absorber Setting Parts
364
Suspension Setting (Front Fork)
365
Suspension Setting (Rear Shock Absorber)
366
Advertisement
Advertisement
Related Products
Yamaha YZ450F(X)
Yamaha YZ450FX 2019
Yamaha YZ450FX 2022
Yamaha YZ450FX 2023
Yamaha YZ450FXP 2023
Yamaha YZ450F(Y)
YAMAHA YZ450F(W)
Yamaha yz450f 2007
Yamaha YZ450F(Y) 2009
Yamaha YZ450F 2006
Yamaha Categories
Motorcycle
Musical Instrument
Electronic Keyboard
Receiver
Amplifier
More Yamaha Manuals
Login
Sign In
OR
Sign in with Facebook
Sign in with Google
Upload manual
Upload from disk
Upload from URL