Market Position:
The 2007 Yamaha YZ250F was a highly competitive motocross and off-road racing machine, known for its potent four-stroke engine and agile handling. This manual is essential for owners and mechanics aiming to maintain and repair this performance-oriented motorcycle.
Competitors:
Competed directly with models like the Honda CRF250R, Kawasaki KX250F, and Suzuki RM-Z250.
Key Features Vehicle:
Liquid-cooled, 250cc, DOHC, 4-valve, single-cylinder engine; 5-speed transmission; aluminum frame; Kayaba suspension components.
Key Features Manual:
Factory original content, detailed diagrams, specific torque values, troubleshooting guides, and comprehensive coverage for all major systems.
Engine:
Complete engine overhaul, cylinder head, piston, crankshaft, valve train, lubrication system, cooling system.
Fuel System:
Carburetor (Keihin FCR41), fuel pump, fuel lines, fuel tank.
Transmission:
Gearbox disassembly, inspection, assembly, shifting mechanisms.
Clutch:
Clutch operation, friction plates, steel plates, springs, hub, basket, pressure plate, cable adjustment.
Suspension:
Front forks (Kayaba, USD), rear shock absorber (Kayaba), linkages, adjustments, servicing.
Brakes:
Front and rear hydraulic disc brakes, caliper overhaul, master cylinders, brake fluid replacement, bleeding procedures.
Electrical System:
Ignition system (CDI), lighting, starting system (kickstart), wiring diagrams, battery maintenance.
Frame And Body:
Chassis inspection, frame components, body panels, seat, handlebars, footpegs.
Wheels And Tires:
Wheel bearing inspection and replacement, spoke tensioning, tire selection and mounting.
Maintenance:
Regular inspection, oil changes, filter replacements, chain adjustment, spark plug service, valve clearance checks.
Troubleshooting:
Diagnosis of common engine, electrical, and chassis problems with systematic approaches.
Repair:
Step-by-step instructions for component disassembly, repair, and reassembly.
Rebuild:
Complete engine and transmission rebuild procedures.
Technical Depth:
Comprehensive, covering routine maintenance to full engine and transmission overhauls, including detailed specifications and diagnostics.
Engine Type:
Four-stroke, liquid-cooled, DOHC, 4-valve
Bore X Stroke:
77.0 mm x 53.6 mm
Compression Ratio:
12.5:1
Horsepower:
Estimated 38-40 HP (at crankshaft)
Torque:
Estimated 19-20 lb-ft (at crankshaft)
Carburetor:
Keihin FCR41 (Flat CR)
Fuel Type:
Unleaded gasoline, minimum 90 octane
Oil Capacity:
1.00 L (with filter change)
Coolant Type:
Yamalube coolant or equivalent (50/50 mix with distilled water)
Ignition System:
CDI (Capacitor Discharge Ignition)
Safety Ratings:
N/A (Motorcycle safety ratings are typically not standardized like automobiles; focus is on operational safety.
Active Safety:
Powerful hydraulic disc brakes (front and rear), responsive handling.
Passive Safety:
Robust frame construction, protective bodywork.
Infotainment Features:
N/A (This is a performance off-road motorcycle; no infotainment systems are present.)
Driver Assistance Features:
N/A (No electronic rider aids such as traction control or ABS are present on this model.)
Engine Management System:
Basic CDI ignition system with mechanical carburetor control. No electronic fuel injection or advanced engine mapping.
Oil Change Interval:
Every 10-15 hours of riding or annually. The manual provides detailed procedures for checking oil level and quality.
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions. Manual details cleaning and oiling procedure.
Spark Plug Service:
Check and clean/gap every 10-20 hours. Replacement based on wear. Manual specifies correct plug type (e.g., NGK CR9E or equivalent).
Valve Clearance Check:
Every 20-30 hours of riding. Manual provides exact clearance specifications and adjustment procedures.
Engine Oil Type:
Yamalube 4 (SAE 10W-40) or API SG or higher, JASO MA compliant.
Coolant Type:
Yamalube Coolant or equivalent (Ethylene Glycol based, 50/50 with distilled water).
Brake Fluid Type:
DOT 4 Hydraulic Brake Fluid.
Common Issues 2007 Yz250F:
While generally robust, potential issues can include carburetor jetting sensitivity to modifications, occasional clutch fade under heavy use, and normal wear items like wheel bearings and suspension seals. The manual helps diagnose and address these.
Engine Bolt Torque:
Detailed torque specifications for all critical engine components (e.g., cylinder head bolts, crankcase bolts) are provided in the manual.
Chassis Bolt Torque:
Torque values for wheel nuts, suspension linkages, handlebars, and other chassis components are specified for safety and proper assembly.
Brand Heritage:
Yamaha has a long-standing reputation for producing high-performance motorcycles across various disciplines, including motocross. The YZ line has been a cornerstone of their off-road racing success.
Model Evolution Yz250F:
The YZ250F underwent significant changes leading up to and following the 2007 model year, including chassis updates and engine refinements. The 2006 model introduced a new generation of the YZ250F, which this manual covers extensively.
Production Period:
The YZ250F has been in continuous production since its introduction in 2001. The 2007 model is part of the second generation.
