Yamaha YZ250 Repair and Repair Manual 2009 YZ 250

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🏷️ Basic Information Identification Make: Yamaha Model: YZ250 Year: 2009 Vehicle Type: Off-Road Motorcycle Chassis Code: 4XM1 Codes Vin Prefix: JY 👋 Introduction Market Position Category: Performance Motocross/Off-Road Motorcycle Target...

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类型: Motorcycle

斯库: 469844

标签: 2009 Motorcycle Motorcycles Yamaha YZ Models YZ250

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Description

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

YZ250

Year:

Vehicle Type:

Off-Road Motorcycle

Chassis Code:

Codes

Vin Prefix:

👋 Introduction

Market Position

Category:

Performance Motocross/Off-Road Motorcycle

Target Audience:

Motocross racers, enduro riders, off-road enthusiasts seeking performance and reliability

Competitive Analysis

Key Competitors:

KTM 250 SX, Honda CR250R (historically), Kawasaki KX250, Suzuki RM250

Key Features

Engine Type:

Liquid-cooled, 2-stroke, single-cylinder

Suspension:

Industry-leading KYB SSS (Speed Sensitive System) front forks and KYB rear shock absorber

Performance Focus:

Aggressive power delivery, agile handling, championship-winning pedigree

📋 Manual Details

Coverage Areas

Manual Title:

Yamaha YZ250 Motorcycle Workshop Repair Service Manual

Coverage Years:

Applicable Models:

YZ250

Page Count

Estimated Page Count:

Refer to specific product listing for exact page count (typically 300+ pages for a full workshop manual)

Manual Type

Manual Type:

Workshop Repair Service Manual

Manual Purpose:

Service and Repair

Language

Language:

English

Format

Format:

Downloadable PDF

📖 Manual Coverage

Systems Covered

Engine:

Top-end (cylinder, piston, rings, head), Bottom-end (crankcase, crankshaft, connecting rod, bearings), Cooling System (if applicable, though YZ250 is typically air-cooled), Lubrication System

Transmission:

Gearbox operation, clutch, shifting mechanisms, internal components, fluid changes

Fuel System:

Carburetor disassembly, cleaning, adjustment, jetting, fuel lines, fuel tank maintenance

Ignition System:

CDI unit, spark plug, stator, ignition timing, troubleshooting

Electrical System:

Wiring diagrams, lighting, battery maintenance, charging system (if applicable), switches, fuses

Suspension:

Front forks (KYB SSS - Speed Sensitive System), rear shock absorber (monoshock), seal replacement, oil levels, valving, adjustments

Brakes:

Front and rear hydraulic disc brakes, caliper service, master cylinder overhaul, brake pad replacement, bleeding procedures, fluid specifications

Wheels Tires:

Wheel bearing replacement, rim maintenance, tire mounting and dismounting, spoke tensioning

Chassis Frame:

Frame inspection, steering head bearing service, swingarm and linkage maintenance

Bodywork:

Fairing removal and installation, seat, fenders, handlebars, controls

Procedures Included

Maintenance:

Pre-ride inspections, oil changes, filter cleaning/replacement, chain adjustment and lubrication, brake system checks, suspension adjustments, general cleaning

Troubleshooting:

Diagnosing common performance issues, electrical problems, starting difficulties, and mechanical malfunctions with symptom-based guides

Repair:

Complete engine rebuild, transmission overhaul, suspension component servicing, brake system repairs, electrical component replacement

Disassembly Reassembly:

Detailed procedures for stripping down and rebuilding major components

Torque Specifications:

Specific torque values for all critical fasteners

Wiring Diagrams:

Comprehensive electrical schematics for troubleshooting and repair

Technical Depth

Depth Level:

Comprehensive Workshop Level (suitable for professional technicians and experienced DIY mechanics)

Diagnostic Capabilities:

Includes troubleshooting trees and diagnostic charts for identifying and resolving issues

Rebuild Procedures:

Detailed step-by-step instructions for complete engine and transmission rebuilds

📊 Manual Specifications

File Format

File Type:

Searchable Text:

Likely yes, depending on the scan quality of the original document

Print Quality

Printability:

Designed for digital viewing, but printable

Binding Type

Binding:

N/A (Digital Format)

Paper Type

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Type:

2-stroke, liquid-cooled, reed valve, YPVS (Yamaha Power Valve System) equipped

Displacement:

249 cc

Bore X Stroke:

66.4 mm x 72.0 mm

Compression Ratio:

9.3:1 (typical, check manual for specific variant)

Ignition:

Digital CDI (Capacitor Discharge Ignition)

Performance

Horsepower:

Approximately 50-55 HP (estimated, varies with tuning and dyno)

Torque:

Approximately 30-35 lb-ft (estimated, varies with tuning and dyno)

Fuel System

Carburetor:

Keihin PWK38S (38mm) with Power Jet

Fuel Type:

Unleaded gasoline, minimum 91 octane (RON+MON)/2

Fuel Mixture:

Pre-mix (Gasoline to Oil ratio typically 50:1 for Yamalube 2R or equivalent) - Consult manual for specific recommendations

Fuel Tank Capacity:

8.0 Liters (2.1 US gal)

🔧 Transmission

Standard

Type:

5-speed constant mesh

Clutch:

Wet, multiple-disc, cable-actuated

Features

Gear Ratios:

Refer to manual for specific ratios (e.g., 1st: 2.500, 2nd: 1.786, 3rd: 1.333, 4th: 1.091, 5th: 0.917)

Final Drive:

Chain drive (DID 520 VT2 or similar)

Transmission Oil Type:

Yamaha Gear Oil 10W-30 or equivalent API GL-4

Transmission Oil Capacity:

Approximately 0.75 Liters (0.79 US qt)

📐 Dimensions

Exterior

Length:

2,181 mm (85.9 in)

Width:

825 mm (32.5 in)

Height:

1,280 mm (50.4 in)

Seat Height:

995 mm (39.2 in)

Wheelbase:

1,476 mm (58.1 in)

Ground Clearance:

355 mm (14.0 in)

Weights

Dry Weight:

97 kg (213.8 lbs)

Wet Weight:

103 kg (227.1 lbs) (estimated, with all fluids)

Front Tire Size:

80/100-21 51M

Rear Tire Size:

110/90-19 62M

Wheelbase Type:

Spoked wheels

🛡️ Safety Features

Ratings

Safety Rating:

N/A (Off-road motorcycles are not typically rated by safety organizations like NHTSA or Euro NCAP)

Active Features

Brakes:

Hydraulic disc brakes front and rear for strong stopping power

Suspension Control:

Adjustable suspension for optimized handling and stability

Passive Features

Frame Construction:

Durable aluminum twin-spar frame for rigidity and impact resistance

💡 Technology Features

Infotainment

Infotainment System:

N/A (Purpose-built off-road competition machine)

Driver Assistance

Driver Assistance Features:

N/A (Focus on rider control and feedback)

Performance Enhancements

Engine Management:

Yamaha Power Valve System (YPVS) for improved low-to-mid range power delivery.

Suspension Technology:

KYB SSS (Speed Sensitive System) front forks with adjustable compression and rebound damping; KYB rear shock with adjustable preload, compression, and rebound damping.

🔧 Maintenance

Service Intervals

Oil Change Transmission:

Every 10-15 hours of riding or annually, whichever comes first. Consult manual for precise intervals.

Air Filter Cleaning:

After every few rides, or more frequently in dusty conditions. Refer to manual.

Spark Plug Replacement:

As needed, typically inspected every 20-30 hours. Consult manual for specific plug type and gap.

Chain Lubrication Adjustment:

Every ride or every 5-10 hours. Refer to manual for proper tension.

Fluid Specifications

Engine Oil Type:

Yamalube 2R or equivalent high-performance 2-stroke racing oil (pre-mix)

Coolant Type:

Yamaha Super Coolant or equivalent ethylene glycol-based antifreeze (1:1 mixture with distilled water)

Brake Fluid Type:

DOT 4 hydraulic brake fluid

Known Issues

Clutch Wear:

Can experience wear under aggressive riding; regular inspection and adjustment is key.

Carburetor Jetting:

May require re-jetting based on altitude, temperature, and modifications for optimal performance.

Suspension Seals:

Fork and shock seals can wear over time, leading to oil leaks; regular maintenance is advised.

📚 Vehicle History

Brand Heritage

Brand Focus:

Yamaha has a long and successful history in motorsport, particularly in motocross and Grand Prix racing.

Model Evolution

Yz Lineage:

The YZ250 is a long-standing and iconic model in Yamaha's off-road lineup, evolving through many iterations and championships.

2009 Updates:

The 2009 model benefited from continuous refinement, including chassis improvements and continued use of the highly regarded KYB SSS suspension components.

Production

Production Era:

Ongoing since the 1970s, with the 2009 model being part of the modern era of the YZ250.

🏆 Awards & Recognition

Recognitions

Motocross Championships:

The YZ250 platform has been a dominant force in professional motocross and supercross, accumulating numerous championship titles over its history.

Ratings

Industry Reviews:

Consistently praised by motorcycle journalists and riders for its potent engine, superior suspension, and sharp handling.

Certifications

Emissions Certification:

Designed for off-road competition use; emissions standards may vary by region and are typically not applicable in the same way as street-legal vehicles.