Segment:
Performance Motocross Motorcycle
Target Audience:
Motocross racers, off-road enthusiasts, and motorcycle mechanics.
Key Competitors:
Honda CRF250R, Kawasaki KX250F, Suzuki RM-Z250, KTM 250 SX-F
Vehicle Selling Points:
Known for its powerful four-stroke engine, agile handling, and competitive performance in its class.
Benefit To Owner:
Empowers owners to perform comprehensive maintenance and repairs, saving on labor costs and ensuring optimal performance.
Primary Coverage:
Complete Repair and Maintenance
Specific Sections:
Engine Tear Down & Rebuild, Chassis, Electrical System, Troubleshooting
Type:
Factory Service Manual / Repair Manual
Digital Format:
Instant Download (likely PDF)
Features:
Clickable Chapters, Pictures, Part Diagrams
Engine:
Complete overhaul, including internal components, lubrication, cooling, and fuel delivery.
Transmission:
Clutch, gearbox internals, shift mechanism, and related lubrication.
Chassis:
Frame, suspension (front forks and rear shock absorber), steering, and wheels.
Electrical System:
Ignition, lighting, charging system, wiring diagrams, and component testing.
Brakes:
Front and rear brake systems, including hydraulic lines, calipers, and master cylinders.
Fuel System:
Carburetor tuning, jetting, fuel lines, and fuel tank.
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, lubrication points, and general upkeep.
Repair:
Step-by-step instructions for component removal, installation, and repair for all major systems.
Troubleshooting:
Diagnostic procedures for common issues, fault finding, and error codes (if applicable).
Rebuilds:
Comprehensive guides for complete engine teardown and reassembly, and other major component overhauls.
Depth:
Factory-level detail, suitable for professional technicians and experienced DIY mechanics.
Data Richness:
Includes detailed torque specifications, clearance measurements, and diagnostic data.
Type:
Four-stroke, Liquid-cooled, DOHC, Single-cylinder
Bore X Stroke:
76.0 mm x 54.9 mm
Compression Ratio:
12.5:1
Valve Train:
5-titanium valve configuration (specifics vary by sub-model, but this was a hallmark of YZ-Fs).
Horsepower Estimate:
Approx. 38-40 HP (at crankshaft, dependent on exhaust and tuning)
Torque Estimate:
Approx. 20-22 lb-ft (at crankshaft)
Carburetor:
Keihin FCR MX37 (Flat CR carburetor with 'MX' features for improved throttle response)
Fuel Type:
Unleaded Gasoline (91 Octane or higher recommended)
Type:
Liquid-cooled (dual radiators)
Type:
Wet sump with oil filter
Overall Engine Weight Estimate:
Approximately 65-75 lbs (engine assembly only)
Type:
5-speed constant mesh
Clutch Type:
Wet, multi-plate
Gear Ratios:
Detailed ratios for each gear will be present in the manual.
Final Drive:
Chain drive (specific chain pitch, e.g., 520, will be in manual)
Transmission Oil Type:
Yamalube 4 (or equivalent 10W-40 API SG or higher)
Transmission Oil Capacity:
Approx. 0.7 liters (check manual for precise quantity and level check procedure)
Length:
Approx. 82.7 inches (2100 mm)
Width:
Approx. 32.1 inches (815 mm)
Height:
Approx. 50.4 inches (1280 mm)
Wheelbase:
Approx. 57.9 inches (1470 mm)
Ground Clearance:
Approx. 14.2 inches (360 mm)
Dry Weight:
Approx. 213 lbs (96.5 kg)
Wet Weight Estimate:
Approx. 230-235 lbs (with all fluids)
Fuel Tank Capacity:
2.1 gallons (8.0 Liters)
Safety Certification:
Not applicable for off-road motorcycles in the same manner as street vehicles; designed for closed-course competition.
Braking System:
Hydraulic disc brakes front and rear for strong stopping power.
Suspension:
High-performance, adjustable suspension (Kayaba) designed for control and impact absorption.
Chassis Design:
Strong and rigid aluminum frame providing stability and rider feedback.
Features:
N/A (Pure performance off-road motorcycle, no infotainment features)
Features:
N/A (Focus on rider input and mechanical feedback)
Features:
N/A (No electronic connectivity features)
Ignition System:
Digital CDI (Capacitor Discharge Ignition) with variable ignition timing.
Oil Change Interval:
Every 10-15 hours of operation or after significant competitive use. Refer to manual for specific guidance.
Air Filter Cleaning:
After every few rides or as needed based on dusty conditions. Crucial for engine longevity.
Spark Plug Check Replacement:
Check every 20-30 hours, replace as needed or per manual recommendations.
Valve Clearance Check:
Crucial for performance. Typically every 30-50 hours of use. Manual will provide exact specs and procedure.
Engine Oil:
Yamalube 4 (or equivalent) 10W-40 API SG or higher.
Coolant:
High-quality, pre-diluted permanent type antifreeze coolant (e.g., ethylene glycol based) with a 50/50 mix of distilled water.
Brake Fluid:
DOT 4 hydraulic brake fluid.
Common Wear Items:
Piston, rings, clutch plates, valve guides, cam chain, and wheel bearings are typical wear items on high-performance motocross bikes.
Carburetor Tuning:
Carburetor jetting can be sensitive to altitude and temperature changes, requiring periodic adjustments for optimal performance.
Specialized Tools:
Torque wrenches, feeler gauges, piston ring compressor, clutch holding tool, flywheel puller (specific types will be detailed in manual).
Brand Legacy:
Yamaha has a long and successful history in motorcycle racing, particularly in motocross and off-road disciplines, known for innovation and performance.
Yz250F Lineage:
The YZ250F line began in 2001, revolutionizing the 250cc four-stroke class. The 2006 model represented an evolution of this successful platform, with refinements in engine performance, chassis dynamics, and suspension.
Key Advancements 2006:
The 2006 model saw significant updates, including a new engine with improved power delivery, revised suspension settings, and chassis tweaks for better handling, often featuring the 5-valve titanium head and Kayaba Speed Sensitive System (SSS) forks.
Manufacturing Location:
Primarily Japan (Yamaha Motor Company)
Motocross Achievements:
While specific awards for the 2006 model aren't listed individually, the YZ250F platform has consistently been a top contender and winner in AMA Supercross and Motocross championships across various years.
Industry Reviews:
The 2006 YZ250F was generally well-received for its strong engine and improved handling over previous models, though it faced stiff competition.
Emission Standards:
Designed for closed-course competition, not road-legal; emissions are not certified for street use.
