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Yamaha YZ250X 2021 User Manual

Yamaha YZ250X 2021
148 pages
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BF1-28199-10LIT-11626-34-11
Read this manual carefully before operating this vehicle.
YZ250M2
YZ250XM
OWNER’S MANUAL
YZ250
YZ250X
2021
PRINTED IN JAPAN
2020.04-0.9×1 !
(E)
BF1-28199-10_cover.indd 1-3 2020/03/10 13:38:50

Table of Contents

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Yamaha YZ250X 2021 Specifications

General IconGeneral
Engine Type249cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke66.4mm x 72.0mm
IgnitionCDI
Transmission5-speed; multiplate wet clutch
Final DriveChain
Suspension FrontKYB® Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Suspension RearKYB® single shock; fully adjustable, 12.4-in travel
Brakes FrontHydraulic disc, 270mm
Brakes RearHydraulic disc, 245mm
Seat Height38.2 in
Wheelbase58.5 in
Trail4.6 in
Fuel Capacity2.1 gal
Wet Weight229 lb
Tires Front80/100-21
Tires Rear110/100-18

Summary

California Proposition 65 Warning

Important Manual Information

Yamaha YZ Motorcycle Limited Warranty

Safety Information

Motorcycle Safety: Owner Responsibility and Riding

Owner responsibilities, safe riding practices, and protective apparel.

Safety Information (Continued)

Carbon Monoxide Poisoning Prevention

Precautions to avoid carbon monoxide poisoning from engine exhaust.

Starting and Break-in Procedures

Fuel Mixing and Engine Starting

Mixing fuel and oil, and procedures for starting cold and warm engines.

Break-in Procedures

Recommended break-in procedures for new motorcycles.

Maintenance After Break-in

Major Maintenance Checks

Detailed list of engine and chassis components for major maintenance.

Torque-Check Points

General and Engine Tightening Torques

Specifications for general fasteners and engine component torques.

Torque-Check Points (Continued)

Chassis Tightening Torques

Torque specifications for various chassis components.

Motorcycle Care and Storage

General Care Instructions

Proper cleaning methods and precautions to protect the motorcycle.

Motorcycle Care and Storage (Continued)

Brake Contaminant Warning

Warning about contaminants affecting brake performance.

Specifications

General and Engine Specifications

General dimensions, weight, and detailed engine specifications.

Chassis and Torque Specifications

Specifications for chassis components and tightening torques.

Engine Specifications

Engine Core and Fuel Specifications

Engine core specs, fuel, oil, transmission, cooling, and spark plug details.

Clutch Specifications

Specifications related to the clutch mechanism, plates, and springs.

Engine Specifications (Continued)

Gear Ratios and Carburetor Specifications

Gear ratios, drivetrain, air filter, and carburetor specifications.

Chassis Specifications

Chassis, Wheels, Tires, and Brakes

Specifications for chassis, wheels, tires, and brake systems.

Front Suspension Specifications

Specifications for front fork, springs, oil, and travel.

Chassis Specifications (Continued)

Rear Suspension Specifications

Specifications for rear suspension, including spring preload and damping.

Tightening Torques

General Tightening Torque Specifications

Torque values for standard fasteners based on nut/bolt size.

Tightening Torques (Engine)

Engine Component Tightening Torques

Torque specifications for various engine mounting bolts and components.

Tightening Torques (Engine/Chassis)

Engine Tightening Torques (Continued)

Additional torque specifications for engine components.

Chassis Component Tightening Torques (Part 1)

Torque specifications for various chassis components.

Tightening Torques (Chassis)

Chassis Component Tightening Torques (Part 2)

Torque specifications for front brake and related chassis parts.

Chassis Component Tightening Torques (Part 3)

Torque specifications for rear brake and related chassis parts.

Periodic Checks and Adjustments

Maintenance Intervals and Pre-Operation Checks

Schedule for maintenance and essential pre-operation checks.

Engine Checks and Adjustments

Procedures for checking and adjusting engine components.

Maintenance Intervals

Maintenance Schedule Overview

Table outlining maintenance items and intervals (break-in, race, hours).

Maintenance Intervals (Continued)

Pre-Operation Inspection and Maintenance

General Inspection and Maintenance Checklist

Checklist for general inspection before operating the motorcycle.

Engine: Checks and Oil Changes

Engine: Clutch and Air Filter

Engine: Exhaust and Coolant Checks

Engine: Cooling System Maintenance

Chassis: Brake Adjustments

Chassis: Brake Checks

Chassis: Brake Checks (Continued)

Chassis: Brake Bleeding and Chain Slack

Hydraulic Brake System Bleeding

Procedure for bleeding air from the hydraulic brake system.

Chassis: Steering Head and Fork Service

Chassis: Front Fork Damping

Chassis: Rear Shock Absorber

Chassis: Rear Suspension Damping

Front Wheel Service

Rear Wheel Service

Front Brake Service

Replacing Front Brake Pads

Step-by-step guide for replacing front brake pads.

Front Brake Service (Continued)

Rear Brake Service

Replacing Rear Brake Pads

Step-by-step guide for replacing rear brake pads.

Rear Brake Service (Continued)

Handlebar Service (Continued)

Front Fork Service

Front Fork Service (Continued)

Assembling Front Fork Legs

Step-by-step guide for assembling the front fork legs.

Front Fork Service (Continued)

Front Fork Installation

Installing the Front Fork Legs

Procedure for installing the front fork legs onto the motorcycle.

Front Fork Adjustments

Front Fork Damping Adjustments

Adjusting rebound and compression damping forces.

Steering Head Service (Continued)

Chain Drive Service (Continued)

Engine: Clutch System

Clutch System Installation

Clutch System Installation (Continued)

Electrical System Overview

Wiring Diagram

Vehicle Wiring Diagram

Schematic diagram of the motorcycle's electrical wiring.

Troubleshooting Guide

Engine Troubleshooting

Common engine problems, causes, and solutions.

Troubleshooting: Engine Starting

Engine Starting Problems (No Spark)

Diagnosing and fixing engine starting issues related to no spark.

Engine Starting Problems (Fuel Supply)

Diagnosing and fixing engine starting issues related to fuel supply.

Troubleshooting: Engine Performance

Engine Problems (Low Compression)

Diagnosing and fixing engine problems related to low compression.

Engine Problems (Spark Plug and Fuel)

Troubleshooting spark plug and fuel supply issues for starting.

Troubleshooting: Engine Performance (Mid-High Speed)

Engine Problems (Mid-High Speed Fuel Issues)

Troubleshooting fuel issues affecting mid to high-speed engine performance.

Troubleshooting: Engine Performance (Mixture)

Engine Problems (Fuel Mixture and Carburetor)

Troubleshooting fuel mixture and carburetor issues for engine performance.

Troubleshooting: Engine Noise

Troubleshooting: Clutch Issues

Manual Clutch Slippage and Dragging

Diagnosing and fixing clutch slippage and dragging problems.

Troubleshooting: Transmission Issues

Transmission Shifting and Gear Problems

Troubleshooting difficulties with shifting gears and gears jumping out.

Troubleshooting: Cooling System Issues

Engine Overheating and Water Pump Noise

Diagnosing and fixing engine overheating and water pump noise.

Troubleshooting: Brake Issues

Disc Brake Performance Problems

Diagnosing and fixing poor performance of disc brakes.

Troubleshooting: Suspension Issues (Front Fork)

Front Fork Hardness and Softness Problems

Diagnosing and fixing front fork stiffness and softness issues.

Front Fork Leaking Oil Issues

Troubleshooting front fork oil leaks.

Rear Suspension Hardness Issues

Diagnosing and fixing rear suspension stiffness problems.

Troubleshooting: Steering and Handling

Handlebar Wobble and Heavy Steering

Diagnosing and fixing handlebar wobble and heavy steering.

Troubleshooting: Wheel Vibration

Front Wheel Vibration Diagnosis

Diagnosing and fixing front wheel vibration.

Rear Wheel Vibration Diagnosis

Diagnosing and fixing rear wheel vibration.

Tuning Guide

Engine Tuning: Carburetor Settings

Carburetor settings, atmospheric conditions, and test runs for engine tuning.

Engine Tuning: Carburetor Basics

Carburetor Setting Fundamentals

Role of carburetor settings and factors affecting them.

Test Run and Spark Plug Analysis

Performing test runs and analyzing spark plug discoloration for tuning.

Engine Tuning: Throttle Valve Effects

Engine Tuning: Jet Adjustments

Engine Tuning: Jet Needle Settings

Engine Tuning: Settings by Conditions

Carburetor Settings for Symptoms

Troubleshooting carburetor symptoms and adjusting settings.

Engine Tuning: Lean and Rich Mixture

Tuning for Lean Mixture Symptoms

Tuning for lean mixture symptoms like stalling and poor acceleration.

Tuning for Rich Mixture Symptoms

Tuning for rich mixture symptoms like slow pickup and sooty plugs.

Engine Tuning: Spark Plugs

Chassis Tuning: Sprockets and Tires

Chassis Tuning: Front Fork

Chassis Tuning: Front Fork and Rear Suspension

Chassis Tuning: Rear Suspension Preload

Chassis Tuning: Front Fork Symptoms

Front Fork Suspension Settings by Symptom

Adjusting front fork settings based on symptoms like stiffness or bottoming out.

Chassis Tuning: Rear Suspension Symptoms (Part 1)

Rear Shock Absorber Settings by Symptom (Part 1)

Adjusting rear suspension based on symptoms like stiffness or sponginess.

Chassis Tuning: Rear Suspension Symptoms (Part 2)

Rear Shock Absorber Settings by Symptom (Part 2)

Adjusting rear suspension for symptoms like heavy drag and poor grip.

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