Positioning:
The Yamaha YZ250F is a premier motocross and off-road competition motorcycle, known for its performance and agility.
Competitors:
Competes directly with models like the Honda CRF250R, Kawasaki KX250F, and Suzuki RM-Z250.
Features 2009 2010:
These years saw continued refinement of the YZ250F's aluminum frame, powerful four-stroke engine, and advanced suspension systems.
Value Proposition:
This workshop manual provides essential technical data and procedures to maintain, diagnose, and repair the Yamaha YZ250F for optimal performance and longevity.
Engine:
Complete engine disassembly, assembly, tuning, and component overhaul
Fuel System:
Carburetor tuning, cleaning, and replacement; fuel tank and lines
Ignition System:
CDI, spark plug diagnosis, coil testing
Cooling System:
Radiator service, coolant flushing and replacement, thermostat operation
Transmission Drivetrain:
Clutch operation, gear shifting mechanisms, final drive chain and sprockets
Suspension Front:
Fork disassembly, seal replacement, damping adjustments, spring rates
Suspension Rear:
Monoshock removal, linkage maintenance, shock absorber servicing, spring adjustments
Brakes Front:
Caliper servicing, pad replacement, rotor inspection, hydraulic system bleeding
Brakes Rear:
Caliper servicing, pad replacement, rotor inspection, hydraulic system bleeding
Electrical System:
Wiring diagrams, battery maintenance, lighting system, starter system
Exhaust System:
Muffler and pipe inspection, mounting, and gasket replacement
Frame Chassis:
Frame inspection, swingarm maintenance, steering head bearing service
Wheels Tires:
Spoke tensioning, rim maintenance, tire mounting and balancing
Controls:
Throttle cable adjustment, clutch lever adjustment, shifter linkage
Maintenance:
Regular service checks, oil changes, filter replacements, lubrication
Repair:
Component disassembly, repair, and reassembly for all major systems
Troubleshooting:
Diagnostic flowcharts, common problem identification and solutions
Specifications:
Torque values, clearances, fluid capacities, performance data
Rebuilds:
Detailed instructions for engine and suspension component rebuilds
Depth:
Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts
Diagnostic Level:
Advanced diagnostic procedures and troubleshooting trees
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 5-valve, single-cylinder
Bore X Stroke:
77.0 mm x 53.6 mm
Compression Ratio:
12.8:1 (typical)
Ignition:
Digital CDI with TCI
Horsepower:
Approx. 39-42 HP (at crankshaft, variation based on tuning)
Torque:
Approx. 20-22 lb-ft (at crankshaft, variation based on tuning)
Carburetor:
Keihin FCR39MX (flat-slide, dual-intake) with accelerator pump
Fuel Type:
Unleaded gasoline, minimum 91 octane
Engine Oil Type:
Yamalube 4 (or equivalent 10W-40 API SG or higher)
Engine Oil Capacity:
1.10 L (1.16 US qt) without filter change; 1.20 L (1.27 US qt) with filter change
Transmission Oil Type:
Yamalube 4 (or equivalent 10W-40 API SG or higher)
Transmission Oil Capacity:
0.70 L (0.74 US qt)
Transmission Type:
Constant-mesh 5-speed
Clutch Type:
Wet, multi-plate, cable-actuated
Gear Ratios:
Specific ratios detailed in manual (e.g., 1st: 2.615, 2nd: 1.933, 3rd: 1.556, 4th: 1.333, 5th: 1.150)
Oil Change Interval:
Every 10-15 hours of riding, or as recommended by manual for specific conditions.
Air Filter Cleaning:
After every ride, or more frequently in dusty conditions.
Spark Plug Inspection:
Every 15-20 hours of riding.
Chain Lubrication Adjustment:
Every 5-10 hours of riding, or as needed.
Coolant Type:
High-quality antifreeze coolant (50/50 mix with distilled water)
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid
Carburetor Tuning:
Carburetor jetting can require fine-tuning based on altitude, temperature, and modifications. Manual provides detailed guidance.
Suspension Seals:
Fork and shock seals can wear over time; regular inspection and maintenance are crucial.
Clutch Wear:
Clutch plates can wear depending on riding style; manual details inspection and replacement procedures.
Yamaha Heritage:
Yamaha has a long and storied history in motocross racing, with a consistent focus on innovation and performance.
Yz250F Evolution:
The YZ250F transitioned to fuel injection in later years, but the 2009-2010 models represent a peak of the carbureted generation with significant chassis and engine refinements.
Production Era:
The YZ250F platform has been in continuous production since its introduction in 2001, with yearly updates.
