Now Yamaha YZ250 YZ 250 2007 07 2-STROKE Service Repair Workshop Manual

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🏷️ Basic Information Identification Make: Yamaha Model: YZ250 Year: 2007 Model Variant: YZ250 2-Stroke Product Name: Now Yamaha YZ250 YZ 250 2007 07 2-STROKE Service Repair Workshop Manual 👋 Introduction...

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类型: Motorcycle

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标签: 2007 Motorcycle Motorcycles Yamaha YZ 250 YZ Models YZ250

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Description

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

YZ250

Year:

Model Variant:

YZ250 2-Stroke

Product Name:

Now Yamaha YZ250 YZ 250 2007 07 2-STROKE Service Repair Workshop Manual

👋 Introduction

Market Position

Segment:

High-performance Motocross (MX) motorcycle.

Target Audience:

Enthusiast riders, amateur racers, and professional mechanics specializing in off-road motorcycles.

Competitive Analysis

Key Competitors:

Honda CR250R, Kawasaki KX250, Suzuki RM250, KTM 250 SX.

Key Features

Vehicle Heritage:

The YZ250 has a long and successful lineage in professional motocross, known for its potent two-stroke power delivery and agile handling.

Manual Value Proposition:

Provides essential technical data and procedures to maintain, troubleshoot, and repair the 2007 YZ250, ensuring optimal performance and longevity.

📋 Manual Details

Coverage Areas

Primary Coverage:

2007 Yamaha YZ250 2-Stroke

Secondary Coverage Note:

Will work with similar year models (e.g., 1982 YZ250 mentioned as example)

Page Count

Estimated Page Count:

Approximately 400-600 pages (typical for comprehensive workshop manuals of this era)

Manual Type

Type:

Service Repair Workshop Manual

Language

Language:

English

Format

Format:

Digital (likely PDF, downloadable)

📖 Manual Coverage

Systems Covered

Engine:

Complete engine disassembly, assembly, tuning, diagnostics, top-end, bottom-end, cooling system, lubrication.

Transmission:

Gearbox inspection, repair, clutch system, shift mechanism, lubrication.

Fuel System:

Carburetor (Keihin PWK type) overhaul, jetting, fuel tank, fuel lines, fuel pump (if applicable).

Ignition System:

CDI ignition, spark plug, stator, flywheel, timing.

Exhaust System:

Pipe inspection, silencer maintenance, baffle cleaning/replacement.

Chassis Suspension:

Front fork (Sachs/Showa typically for this era) servicing, rear shock absorber (Monoshock) rebuild, linkage maintenance, bearings.

Brakes:

Hydraulic disc brake systems (front and rear), caliper maintenance, master cylinder service, fluid replacement, bleeding procedures.

Wheels Tires:

Spoke inspection and tensioning, wheel bearing replacement, tire mounting/dismounting, recommended pressures.

Electrical System:

Wiring diagrams, lighting (if applicable for competition), kill switch, basic component testing.

Bodywork Controls:

Handlebar, levers, cables, footpegs, seat, plastic body panel removal and installation.

Procedures Included

Preventative Maintenance:

Regular service intervals, lubrication points, filter cleaning/replacement, bolt torque checks.

Troubleshooting:

Diagnostic flowcharts, symptom analysis, common problem identification and solutions.

Repair Procedures:

Step-by-step instructions for component removal, disassembly, cleaning, inspection, reassembly, and adjustment.

Rebuilds:

Engine top-end (piston, rings, cylinder), crankshaft, gearbox, carburetor, suspension forks, rear shock.

Specifications Data:

All necessary torque values, clearances, fluid levels, capacities, and component measurements.

Technical Depth

Depth:

Comprehensive from basic owner maintenance to complete engine and chassis overhauls. Suitable for both novice mechanics and experienced technicians.

📊 Manual Specifications

File Format

Digital Format:

Likely PDF with searchable text for ease of navigation. May include high-resolution images and diagrams.

Print Quality

Image Quality:

Expect clear, legible diagrams and illustrations, critical for accurate repair.

Binding Type

Binding Type:

N/A (Digital Format)

Paper Type

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Type:

Liquid-cooled, 2-stroke, reed valve induction

Displacement:

249cc

Bore X Stroke:

66.4 mm x 72.0 mm

Compression Ratio:

8.8:1 to 9.2:1 (depending on combustion chamber type and altitude adjustments)

Cylinder Design:

Single cylinder, aluminum with nickel-silicon carbide plating

Power Valve System:

Yamaha Power Valve System (YPVS) for improved low-end torque and broader powerband.

Performance

Horsepower Estimate:

Approximately 45-50 HP at peak RPM (factory figures often not disclosed, based on industry benchmarks).

Torque Estimate:

Approximately 30-33 lb-ft at peak RPM.

Fuel System

Carburetor Model:

Keihin PWK38S (38mm flat slide carburetor)

Fuel Type Recommendation:

Unleaded gasoline with an octane rating of 91 or higher. Pre-mix oil ratio typically 32:1 or 40:1 with high-quality 2-stroke oil.

Ignition System

Ignition Type:

Digital CDI (Capacitor Discharge Ignition)

Spark Plug Recommendation:

NGK BR9ES or equivalent

Cooling System

Type:

Liquid-cooled

Coolant Capacity:

Approximately 0.65 liters

Coolant Type Recommendation:

High-quality ethylene glycol-based coolant (50/50 mix with distilled water)

🔧 Transmission

Standard

Type:

5-speed manual constant mesh

Clutch Type:

Wet, multiple-disc

Features

Gear Ratios:

Specific ratios detailed in manual; designed for motocross application.

Transmission Oil Capacity:

Approximately 0.65 liters

Transmission Oil Recommendation:

Yamalube 10W-40 or equivalent API SG or higher motorcycle gear oil.

📐 Dimensions

Exterior

Overall Length:

Approximately 2185 mm (86.0 in)

Overall Width:

Approximately 820 mm (32.3 in)

Overall Height:

Approximately 1270 mm (50.0 in)

Seat Height:

Approximately 990 mm (39.0 in)

Wheelbase:

Approximately 1475 mm (58.1 in)

Weights

Dry Weight:

Approximately 96 kg (211.6 lbs)

Wet Weight Estimate:

Approximately 102 kg (225 lbs) (with all fluids)

Fuel Tank Capacity:

Approximately 8.0 liters (2.1 US gal)

Ground Clearance:

Approximately 355 mm (14.0 in)

🛡️ Safety Features

Ratings

Safety Certification:

Not applicable for competition/off-road motorcycles; designed for closed course use.

Active Features

Braking System:

Hydraulic disc brakes front and rear for strong stopping power.

Ergonomics:

Designed for optimal rider control and balance during aggressive riding.

Passive Features

Chassis Construction:

Robust aluminum twin-spar frame for strength and rigidity.

💡 Technology Features

Infotainment

Features:

None (pure motocross racing platform).

Driver Assistance

Features:

None (pure motocross racing platform).

Connectivity

Features:

None (pure motocross racing platform).

🔧 Maintenance

Service Intervals

Oil Change Transmission:

Every 10-15 hours of riding or annually. Check level more frequently.

Air Filter Cleaning:

After every ride or as needed based on conditions. Crucial for 2-stroke engine longevity.

Spark Plug Inspection:

Every 5-10 hours of riding. Clean or replace as needed.

Top End Rebuild:

Typically every 40-60 hours of hard riding (piston, rings, cylinder inspection/replacement). Highly dependent on riding style and maintenance.

Suspension Service:

Fork seal and oil service every 20-30 hours. Full rebuild as needed based on performance.

Fluid Specifications

2 Stroke Oil:

Yamalube 2R, Motul 800 2T, Castrol TTS, or equivalent high-performance synthetic 2-stroke racing oil. Mix ratio per manual or preference (e.g., 32:1, 40:1).

Coolant:

50/50 mix of distilled water and ethylene glycol-based coolant (e.g., Yamalube Coolant).

Brake Fluid:

DOT 4 hydraulic brake fluid.

Grease:

Water-resistant bearing grease for wheel bearings, linkage bearings, and swingarm pivot.

Known Issues

Common Wear Items:

Clutch plates, piston rings, spark plugs, air filter, wheel bearings, chain and sprockets, brake pads.

Potential Issues:

Carburetor jetting sensitivity to altitude/temperature, occasional YPVS servo motor issues (if applicable to this generation), crank seal leaks if not properly maintained.

📚 Vehicle History

Brand Heritage

Yamaha Motorcycles:

Yamaha Motor Corporation has a rich history in motorsport, particularly in motocross and off-road racing, dating back to the 1960s.

Model Evolution

Yz Lineage:

The YZ250 is a cornerstone model, consistently evolving through generations, maintaining its two-stroke identity and competitive edge.

2007 Updates:

The 2007 model typically featured refinements in suspension, chassis tuning, and minor engine/carburetor adjustments to maintain competitiveness.

Production

Manufacturing Location:

Japan (typically)

Production Years:

Continuous production since the 1970s, with significant model updates occurring periodically.

🏆 Awards & Recognition

Recognitions

Motocross Achievements:

The YZ250 platform has numerous professional and amateur race wins and championships across various disciplines of motocross and supercross over its history.

Ratings

Performance Reviews:

Consistently praised for its powerful two-stroke engine and agile handling characteristics by automotive journalists and riders.

Certifications

Emission Standards:

Not applicable for competition off-road motorcycles in most regions; intended for closed-course use only.