Target Audience:
Professional Technicians and Experienced DIY Mechanics
Instructional Style:
Step-by-step guidance, mirroring factory-trained technician knowledge.
Benefit:
Empowers owners to make informed maintenance and repair decisions.
Scope:
Comprehensive reference for maintaining and repairing the vehicle or its engine.
Engine:
Complete Engine Overhaul, Lubrication, Cooling, Fuel System, Ignition System, Starting System
Transmission:
Clutch, Gearbox Assembly, Shift Mechanism
Chassis:
Frame, Front Suspension (Fork), Rear Suspension (Shock Absorber), Swingarm, Wheels, Tires
Brakes:
Front and Rear Brake Systems (Hydraulic Disc), Master Cylinders, Calipers, Brake Lines
Electrical:
Wiring Diagrams, Lighting System, Ignition System, Charging System (Stator, Regulator/Rectifier), Battery, Switches, Sensors
Fuel System:
Carburetor Assembly, Fuel Lines, Fuel Filter
Exhaust:
Exhaust System Components, Muffler
Maintenance:
Routine Maintenance, Scheduled Service Intervals, Fluid Changes, Filter Replacements, Chain Adjustments
Disassembly:
Component Disassembly for Repair and Reassembly
Assembly:
Component Assembly with Torque Specifications
Cleaning:
Cleaning Procedures for Various Components
Troubleshooting:
Diagnostic Procedures for Common Problems and Symptoms
Rebuilding:
Engine Rebuilding, Carburetor Rebuilding, Suspension Overhaul
Inspection:
Component Inspection and Wear Limits
Depth:
Comprehensive (from basic maintenance to full engine rebuilds and diagnostics)
Engine Type:
Liquid-cooled, Four-stroke, DOHC, 4-valve
Bore X Stroke:
77.0 mm x 53.6 mm
Compression Ratio:
12.5:1
Horsepower Estimate:
Approximately 30-35 HP (Manufacturer Data Required for Exact Spec)
Torque Estimate:
Approximately 17-19 lb-ft (Manufacturer Data Required for Exact Spec)
Carburetor:
Keihin FCR-MX37 (Flat-CR-Specialized, Manual Slide with Hot Start Lever)
Oil Type Recommendation:
Yamalube 4 (or equivalent SAE 10W-40) - Specific Yamaha Specification Required
Cooling System:
Liquid-cooled
Ignition System:
Digital CDI with TCI (Transistor Controlled Ignition)
Oil Change Interval:
Refer to manual for specific intervals based on usage (e.g., every 1000-2000 km or annual).
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions.
Spark Plug Inspection:
Inspect at regular intervals, replace as needed based on condition.
Chain Maintenance:
Regular cleaning, lubrication, and tension adjustment are critical.
Engine Oil Capacity:
Approximately 1.00 L (1.06 US qt) without filter change, 1.10 L (1.16 US qt) with filter change.
Transmission Oil Capacity:
Approximately 0.60 L (0.63 US qt).
Coolant Type:
High-quality, permanent type coolant (50% mixture with distilled water) - Specific Yamaha Specification Required
Common Wear Items:
Clutch plates, brake pads, tires, fork seals, and chain/sprockets are typical wear items on this model.
Carburetor Tuning:
Carburetor may require occasional tuning and cleaning, especially with fuel variations or altitude changes.
Heritage Summary:
Yamaha has a long-standing reputation for producing high-performance, reliable off-road and dual-sport motorcycles.
Wr250F Lineage:
The WR250F is Yamaha's dedicated off-road competition model, evolved from its YZ250F motocross platform with features for enduro riding.
Production Period:
The WR250F has been in continuous production for many years, with the 2008 model representing a specific iteration of this popular platform.