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Yamaha Manuals
Motorcycle
YZ 2018 Series
Owner's service manual
Yamaha YZ 2018 Series Owner's Service Manual
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Owner's service manual
(252 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contens
Table of Contents
General Information
Location of Important Labels
Description
Identification
Vehicle Identification Number
Engine Serial Number
Fuel Hose Joint Cover
Coupler for Connecting Optional Part
Spark Plug Wrench
Handlebar Protector
Nipple Wrench
Included Parts
Important Information
Preparation for Removal and Disassembly
Replacement Parts
Circlips
Bearings and Oil Seals
Lock Washers/Plates and Cotter Pins
Gaskets, Oil Seals and O-Rings
Basic Service Information
Electrical System
Special Tools
Start Switch
Clutch Lever
Engine Stop Switch
Warning Lights
Control Functions
Shift Pedal
Throttle Grip
Front Brake Lever
Rear Brake Pedal
Sidestand
Starter Knob/Idle Adjusting Screw
Fuel Tank Cap
Starting a Cold Engine
Air Filter Maintenance
Handling Note
Fuel
Starting and Break-In
Starting a Warm Engine
Break-In Procedures
Maintenance after Break-In
Major Maintenance
Torque-Check Points
Motorcycle Care and Storage
Care
Storage
Specifications
General Specifications
Engine Specifications
Chassis Specifications
Electrical Specifications
General Tightening Torque Specifications
Tightening Torques
Engine Tightening Torques
Chassis Tightening Torques
Engine
Lubrication Points and Lubricant Types
Chassis
Lubrication Diagrams
Lubrication System Chart and Diagrams
Cable Routing Diagram
Periodic Checks and Adjustments
Maintenance Intervals
General Inspection and Maintenance
Pre-Operation Inspection and Maintenance
Changing the Coolant
Checking the Coolant Level
Checking the Cooling System
Engine
Checking the Radiator Cap
Checking the Radiator Cap Valve Opening Pressure
Adjusting the Clutch Lever Free Play
Checking the Coolant Circulatory System for Leaks
Adjusting the Throttle Grip Free Play
Lubricating the Throttle Cable
Cleaning the Air Filter Element
Checking the Breather Hoses
Checking the Exhaust System
Checking the Throttle Body Joint
Checking the Engine Oil Level
Checking the Fuel Line
Changing the Engine Oil
Adjusting the Engine Idling Speed
Adjusting the Valve Clearance
Valve Clearance Shim Chart
Bleeding the Brake System
Chassis
Adjusting the Front Brake
Checking the Brake Hose
Adjusting the Rear Brake
Checking the Front Brake Pads
Checking the Rear Brake Pads
Checking the Brake Fluid Level
Checking the Rear Brake Pad Insulator
Adjusting the Drive Chain Slack
Air Bleeding from Front Fork
Checking the Front Fork Legs
Checking the Front Fork Protector Guide
Cleaning the Front Fork Oil Seal and Dust Seal
Adjusting the Front Fork Legs
Adjusting the Rear Shock Absorber Assembly
Checking the Rear Suspension
Checking the Swingarm Operation
Checking and Tightening the Spokes
Checking the Tires
Checking and Adjusting the Steering Head
Checking the Wheel Bearings
Checking the Wheels
Checking and Lubricating the Cables
Lubricating the Drive Chain
Lubricating the Levers
Lubricating the Pedal
Checking the Chassis Fasteners
Lubricating the Sidestand
Checking the Ignition Timing
Checking the Spark Plug
Electrical System
Checking and Charging the Battery
Chassis
General Chassis
Removing the Left Side Cover
Removing the Number Plate
Removing the Seat
Checking the Front Wheel
Front Wheel
Removing the Front Wheel
Assembling the Front Wheel
Disassembling the Front Wheel
Installing the Front Wheel
Checking and Replacing the Rear Wheel Sprocket
Checking the Rear Wheel
Disassembling the Rear Wheel
Rear Wheel
Removing the Rear Wheel
Assembling the Rear Wheel
Installing the Rear Wheel
Front Brake
Checking the Front Brake Disc
Disassembling the Front Brake Caliper
Introduction
Removing the Front Brake Caliper
Assembling the Front Brake Caliper
Checking the Front Brake Caliper
Installing the Brake Caliper Piston
Installing the Front Brake Caliper
Assembling the Front Brake Master Cylinder
Checking the Front Brake Master Cylinder
Removing the Front Brake Master Cylinder
Installing the Front Brake Master Cylinder
Rear Brake
Checking the Rear Brake Disc
Introduction
Assembling the Rear Brake Caliper
Checking the Rear Brake Caliper
Disassembling the Rear Brake Caliper
Removing the Rear Brake Caliper
Installing the Brake Caliper Piston
Installing the Rear Brake Caliper
Checking the Rear Brake Master Cylinder
Removing the Rear Brake Master Cylinder
Assembling the Rear Brake Master Cylinder
Installing the Rear Brake Master Cylinder
Handlebar
Checking the Handlebar
Installing the Handlebar
Removing the Handlebar
Front Fork
Disassembling the Front Fork Legs
Removing the Front Fork Legs
Checking the Front Fork Legs
Assembling the Front Fork Legs
Installing the Front Fork Legs
Steering Head
Checking the Steering Head
Installing the Steering Head
Removing the Lower Bracket
Rear Shock Absorber Assembly
Disposing of a Rear Shock Absorber
Handling the Rear Shock Absorber
Removing the Bearing
Removing the Rear Shock Absorber Assembly
Checking the Connecting Arm and Relay Arm
Checking the Rear Shock Absorber Assembly
Installing the Relay Arm
Installing the Rear Shock Absorber Assembly
Swingarm
Checking the Swingarm
Removing the Bearing
Removing the Swingarm
Installing the Swingarm
Chain Drive
Checking the Drive Chain
Removing the Drive Chain
Checking the Drive Sprocket
Checking the Rear Wheel Sprocket
Installing the Drive Chain
Engine
Cooling System
Fuel System
Fuel Tank
Checking the Fuel Pump Body
Installing the Fuel Pump
Removing the Fuel Pump
Removing the Fuel Tank
Checking the Fuel Sender
Installing the Fuel Sender
Installing the Fuel Tank
Removing the Fuel Sender
Checking and Replacing the Protector
Checking the Damper
Checking the Fuel Pressure
Throttle Body
Checking the Injector
Checking the Throttle Body
Checking the Throttle Body Joint
Adjusting the Throttle Position Sensor
Electrical System
Circuit Diagram
Ignition System
Troubleshooting
Circuit Diagram
Electric Starting System
Starting Circuit Cut-Off System Operation
Troubleshooting
Charging System
Circuit Diagram
Troubleshooting
Circuit Diagram
Signaling System
Troubleshooting
Circuit Diagram
COOLING SYSTEM (for JPN)
Troubleshooting
Circuit Diagram
Fuel Injection System
Ecu Self-Diagnostic Function
Troubleshooting Method
Connecting the Yamaha Diagnostic Tool
Features of the Yamaha Diagnostic Tool
Functions of the Yamaha Diagnostic Tool
Yamaha Diagnostic Tool
Troubleshooting Details
Circuit Diagram
Fuel Pump System
Troubleshooting
Electrical Components
Checking the Switches
Checking the Bulbs and Bulb Sockets
Checking the Fuses
Checking and Charging the Battery
Checking the Relays
Checking the Diode
Checking the Ignition Coil
Checking the Ignition Spark Gap
Checking the Spark Plug Cap
Checking the Crankshaft Position Sensor
Checking the Lean Angle Sensor
Checking the Starter Motor Operation
Checking the Stator Coil
Checking the Fuel Sender
Checking the Rectifier/Regulator
Checking the Coolant Temperature Sensor
CHECKING the RADIATOR FAN MOTOR (for JPN)
Checking the Resister
Checking the Intake Air Pressure Sensor
Checking the Throttle Position Sensor Input Voltage
Checking the Fuel Injector
Checking the Intake Air Temperature Sensor
Troubleshooting
General Information
Incorrect Engine Idling Speed
Starting Failures
Troubleshooting
Clutch Drags
Clutch Slips
Jumps out of Gear
Overheating
Poor Medium-And-High-Speed Performance
Shift Pedal Does Not Move
Shifting Is Difficult
Faulty Front Fork Legs
Front Fork Oil Leaking
Overcooling
Poor Braking Performance
Unstable Handling
Communication Error with Yamaha Diagnostic Tool
List of Diagnostic Codes
List of Self-Diagnostic and Fail-Safe Actions
Sensor Operation Table
Actuator Operation Table
Tuning
Chassis
Drive and Rear Wheel Sprockets Setting Parts
Selection of the Secondary Reduction Ratio (Sprocket)
Tire Pressure
Change in Amount and Characteristics of Fork Oil
Front Fork Setting
Setting of Spring after Replacement
Choosing Set Length
Front Fork Setting Parts
Rear Suspension Setting
Suspension Setting (Front Fork)
Suspension Setting (Rear Shock Absorber)
Kick Starter Kit (Optional Parts)
Parts Location
Setup Procedures
Starting the Engine
Maintenance
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2018
OWNER'S SERVICE MANUAL
YZ250FX
Read this manual carefully before operating this vehicle.
YZ250FXJ
LIT-11626-31-25
B29-28199-13
Table of
Contents
Previous
Page
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Page
1
2
3
4
5
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Chapters
Table of Contens
9
Specifications
41
Periodic Checks and Adjustments
85
Chassis
125
Fuel System
285
Electrical System
297
Troubleshooting
373
Tuning
381
Table of Contents
Troubleshooting
TROUBLESHOOTING
302
TROUBLESHOOTING
308
TROUBLESHOOTING
312
TROUBLESHOOTING
316
TROUBLESHOOTING
320
TROUBLESHOOTING METHOD
325
TROUBLESHOOTING DETAILS
328
TROUBLESHOOTING
350
TROUBLESHOOTING
373
TROUBLESHOOTING
374
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This manual is also suitable for:
Yz250fx 2018
Yz250fxj 2018
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