Market Position:
The 2010 Yamaha YZ250F is a highly competitive motocross bike, known for its performance-oriented 250cc four-stroke engine and agile handling. This manual caters to owners and technicians focused on maintaining and repairing this specific competition machine.
Competitive Analysis:
Competes directly with other 250cc four-stroke motocross bikes from manufacturers like Honda (CRF250R), Kawasaki (KX250F), and KTM (250 SX-F). The YZ250F often praised for its engine characteristics and chassis stability.
Key Features:
This service manual is essential for maximizing the performance and longevity of the 2010 YZ250F, providing in-depth technical guidance for all maintenance and repair tasks.
Systems Covered:
General information, Specifications, Regular inspection and Adjustments, Engine, Chassis, Fuel system, Electrical, Tuning
Page Count:
Estimated 300-400 pages (typical for a comprehensive service manual of this era)
Manual Type:
Service Repair Manual
Format:
Digital (likely PDF, common for sales) or Printed
Engine Systems:
Top-end components (cylinder head, valves, camshafts), piston and connecting rod, crankshaft, lubrication system (oil pump, filter, passages), cooling system (radiator, water pump, hoses), ignition system (CDI, spark plug, wiring), starting system (kick starter mechanism)
Chassis Systems:
Frame, suspension (front forks - type, adjustment, seals; rear shock - linkage, spring preload, damping), steering system, wheels, tires, brakes (front and rear - master cylinders, calipers, pads, rotors, fluid), exhaust system, swingarm, chain and sprockets
Fuel System:
Carburetor (type, jetting, adjustments), fuel tank, fuel pump (if applicable), fuel lines, fuel filter
Electrical System:
Wiring diagrams, battery, charging system (stator, regulator/rectifier), lighting system (headlight, taillight, brake light), switches, fuses, diagnostic indicators
Maintenance Procedures:
Oil changes, filter replacements, air filter cleaning/replacement, spark plug inspection/replacement, valve clearance adjustment, chain lubrication/adjustment, brake pad inspection/replacement, coolant checks/flushes, tire pressure checks, general cleaning and lubrication
Repair Procedures:
Engine disassembly and reassembly (top-end and bottom-end), carburetor overhaul, suspension fork and shock absorber rebuild, brake caliper overhaul, wheel bearing replacement, steering bearing replacement, clutch inspection and adjustment
Troubleshooting:
Diagnostic procedures for common engine performance issues, electrical faults, starting problems, and handling issues
Technical Depth:
Comprehensive coverage from routine maintenance to full engine and chassis overhauls, including detailed torque specifications, clearances, and diagnostic flowcharts.
File Format:
PDF (if digital), professionally bound paperback (if printed)
Print Quality:
High-resolution images and clear text for easy readability and reference
Binding Type:
Saddle-stitched or perfect bound (for printed versions)
Paper Type:
Durable, oil-resistant paper (for printed versions)
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
Carburetor:
Keihin FCR39 (flat slide, single)
Horsepower:
Approximately 40-42 hp (estimated at crankshaft)
Torque:
Approximately 20-22 lb-ft (estimated at crankshaft)
Fuel Type:
Unleaded gasoline, minimum 91 octane (RON+MON)/2)
Fuel Tank Capacity:
8.0 Liters (2.1 US gal)
Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 or 20W-40 motorcycle oil
Oil Capacity With Filter Change:
0.71 Liters (0.75 US qt)
Oil Capacity Without Filter Change:
0.66 Liters (0.70 US qt)
Oil Filter Part Number:
5CU-13440-00-00 (Example, verify with manual)
Transmission Type:
Constant mesh, 5-speed
Clutch Type:
Wet, multi-disc, cable-actuated
Gear Ratios:
1st: 3.000, 2nd: 2.063, 3rd: 1.500, 4th: 1.235, 5th: 1.000
Transmission Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 or 20W-40 motorcycle oil (same as engine oil)
Transmission Oil Capacity:
0.71 Liters (0.75 US qt)
Safety Ratings:
Not applicable (motocross bikes are not subject to standard road vehicle safety ratings)
Braking System:
Hydraulic disc brakes front and rear
Suspension Design:
Optimized suspension for motocross racing, providing control and impact absorption
Frame Design:
Lightweight aluminum bilateral beam frame for rigidity and handling precision
Engine Oil Change:
Every 10-15 hours of riding or annually
Air Filter Cleaning:
After every few rides, or as needed based on dust conditions
Spark Plug Inspection:
Every 15-20 hours of riding
Valve Clearance Check:
Every 20-30 hours of riding
Chain Tension Adjustment:
Every 5-10 hours of riding
Brake Fluid Flush:
Annually
Coolant Type:
High-quality, ethylene glycol-based motorcycle coolant, pre-mixed 50/50 with distilled water
Known Issues:
Common wear items include clutch plates, brake pads, and tires due to the demanding nature of motocross. Occasional issues with carburetor jetting requiring fine-tuning for specific conditions.
