🏷️ Basic Information

Make:

Yamaha

Model:

YZ250F

Year:

2011

Model Code:

N/A (Specific model codes vary by region and trim; service manual typically covers the primary model designation)

👋 Introduction

Segment:

High-performance Motocross / Off-Road Motorcycle

Competitors:

Honda CRF250R, Kawasaki KX250F, Suzuki RM-Z250, KTM 250 SX-F.

Vehicle Features:

Four-stroke single-cylinder engine, fuel injection, advanced suspension, lightweight chassis.

Benefit To Owner:

Empowers owners and technicians to perform all necessary maintenance and repairs, optimizing performance and longevity of the YZ250F.

📋 Manual Details

General Coverage:

Complete tear down and rebuild, maintenance, troubleshooting, technical specifications, part diagrams.

Total Pages:

191

Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

Digital Download (Likely PDF)

📖 Manual Coverage

Engine:

Complete internal engine components, lubrication system, cooling system, fuel injection system, ignition system.

Transmission:

Clutch, gearbox (5-speed constant mesh), shift mechanism.

Chassis:

Frame, suspension (front forks, rear shock absorber), steering, wheels, brakes (front and rear disc).

Electrical:

Ignition system, lighting, charging system (stator, battery), EFI ECU, wiring diagrams.

Fuel System:

Fuel tank, fuel pump, fuel injector, throttle body.

Maintenance:

Scheduled maintenance intervals, oil changes, filter replacements, spark plug inspection/replacement, chain adjustment, air filter cleaning/replacement.

Troubleshooting:

Diagnostic procedures for common problems, error code interpretation (if applicable to EFI), electrical system fault finding.

Repair:

Detailed step-by-step instructions for engine disassembly and reassembly, clutch replacement, suspension service, brake caliper overhaul, wheel bearing replacement.

Specifications:

Torque specifications for all fasteners, engine component clearances, fluid capacities, tire pressure recommendations.

Depth:

Comprehensive. Covers everything from basic fluid checks and adjustments to complete engine and transmission overhauls. Includes detailed diagnostic trees and component specifications for expert-level repairs.

📊 Manual Specifications

File Type:

PDF (Portable Document Format)

Printability:

Printable. Designed to be printed and used in a workshop environment.

Binding:

N/A (Digital Format)

Paper:

N/A (Digital Format)

Features:

Clickable chapters and bookmarks for easy navigation.

Text Search:

Likely searchable text within the PDF for quick information retrieval.

⚙️ Engine Specifications

Engine Type:

Liquid-cooled, four-stroke, DOHC, single-cylinder

Displacement:

249cc

Bore X Stroke:

77.0 mm x 53.6 mm

Compression Ratio:

13.1:1

Horsepower Estimated:

Approximately 38-40 HP (at crankshaft, specific factory figures often not published publicly)

Torque Estimated:

Approximately 20-22 lb-ft (at crankshaft, specific factory figures often not published publicly)

Fuel Delivery:

Yamaha Fuel Injection (YFI) with 44mm throttle body

Fuel Type:

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

Oil Type:

Yamalube 4 (or equivalent) SAE 10W-40 semi-synthetic motorcycle oil

Oil Capacity:

1.10 liters (1.16 US qt) without filter change; 1.20 liters (1.27 US qt) with filter change

Cooling System:

Liquid-cooled, forced circulation

Coolant Type:

Premixed coolant (50% ethylene glycol and 50% deionized water)

Ignition System:

TCI (Transistor Controlled Ignition)

🔧 Transmission

Transmission Type:

Constant mesh, 5-speed

Clutch Type:

Wet, multi-disc, spring-loaded

Gear Ratios:

1st: 2.750, 2nd: 2.063, 3rd: 1.750, 4th: 1.500, 5th: 1.250 (Refer to manual for exact ratios)

Final Drive:

O-ring chain, 13/48 (standard gearing)

Fluid Type:

Yamalube 4 (or equivalent) SAE 10W-40 motorcycle oil (shared with engine)

Fluid Capacity:

Refer to engine oil capacity; typically serviced with engine oil.

📐 Dimensions

Length:

2170 mm (85.4 in)

Width:

825 mm (32.5 in)

Height:

1280 mm (50.4 in)

Wheelbase:

1475 mm (58.1 in)

Wet Weight:

104 kg (230 lbs)

Dry Weight:

99 kg (218 lbs)

Front Suspension Travel:

305 mm (12.0 in)

Rear Suspension Travel:

310 mm (12.2 in)

Front Tire:

80/100-21 51M

Rear Tire:

100/90-19 57M

Wheelbase Type:

Aluminum spoke wheels

🛡️ Safety Features

Crash Safety Ratings:

N/A (Not applicable to off-road motorcycles)

Braking System:

Hydraulic disc brakes, front and rear.

Throttle Control:

Handlebar-mounted throttle assembly.

Frame Construction:

Lightweight aluminum bilateral beam frame for rigidity and handling.

Handlebar:

Handlebar with crossbar for durability and rider control.

💡 Technology Features

Infotainment System:

N/A (Off-road performance motorcycle, no infotainment system)

Rider Aids:

N/A (Focus on rider skill and machine control)

Connectivity Features:

N/A (No electronic connectivity features beyond ECU)

Efi Technology:

Advanced electronic fuel injection system with ECU control for optimized air-fuel ratio, throttle response, and power delivery across varying conditions.

Ignition Control:

TCI ignition system with variable ignition timing managed by the ECU.

🔧 Maintenance

Oil Change Interval:

Every 5-10 hours of riding or annually, whichever comes first (refer to manual for specific recommendations based on usage).

Air Filter Cleaning:

Every 2-5 hours of riding, or more frequently in dusty conditions.

Spark Plug Inspection:

Every 10-15 hours of riding.

Valve Clearance Check:

Every 15-20 hours of riding (critical for performance and longevity).

Engine Oil Spec:

Yamalube 4 (or equivalent) SAE 10W-40 semi-synthetic motorcycle oil meeting API SG or higher, or JASO MA specification.

Coolant Spec:

Premixed coolant (50% ethylene glycol, 50% deionized water) with corrosion inhibitors suitable for aluminum engines.

Brake Fluid Spec:

DOT 4 hydraulic brake fluid.

Common Wear Items:

Clutch plates, piston rings, valve seats, fork seals, wheel bearings, chain and sprockets.

Fuel System Notes:

Fuel pump strainers and injectors can become clogged with debris if fuel quality is poor or tank is not clean. EFI sensors require proper diagnostic tools for troubleshooting.

Engine Notes:

Regular valve clearance checks are paramount to prevent catastrophic engine damage. Overheating can occur if the cooling system is not maintained.

Schedule Link:

Refer to Chapter 3 (Periodical Checks and Adjustments) of the service manual for detailed schedules and procedures.

📚 Vehicle History

Heritage Summary:

Yamaha has a long and successful history in motocross and off-road racing, known for innovation and performance.

Yz250F Evolution Notes:

The YZ250F has undergone significant evolution, transitioning from carbureted models to fuel injection. The 2010 model represents a key stage in this development, featuring the advanced electronic fuel injection system.

Production Origin:

Japan (Primary manufacturing location for Yamaha motorcycles)

Production Years For This Generation:

Typically a generation spans several years, with updates. The fuel-injected 250F platform was well-established by 2010.

🏆 Awards & Recognition

Motocross Awards:

Yamaha YZ models consistently receive accolades and are highly regarded in the professional motocross and off-road racing community.

Editorial Reviews:

The 2011 YZ250F was generally praised for its agile handling, strong mid-range power, and the benefits of fuel injection.