Segment:
Sport ATV segment, targeting recreational riders and enthusiasts.
Competitors:
Competed against models like the Honda TRX250X/EX, Suzuki LT-Z250, and Kawasaki KFX250.
Performance Focus:
Engineered for agile handling, responsive power delivery, and sporty aesthetics.
Target Audience:
Intermediate to advanced riders seeking a capable and fun recreational ATV.
Engine Management:
Includes detailed diagnostics and repair procedures for the engine's fuel, ignition, and lubrication systems.
Transmission Drivetrain:
Covers maintenance, inspection, and repair of the transmission, clutch, and final drive components.
Suspension Steering:
Detailed procedures for front and rear suspension systems, including shock absorbers, swingarms, and steering mechanisms.
Braking System:
Comprehensive coverage of front and rear brake systems, including hydraulics, calipers, rotors, and bleeding procedures.
Electrical System:
Extensive wiring diagrams, troubleshooting guides, and component testing for the battery, lighting, ignition, and other electrical circuits.
Cooling System:
Information on the radiator, coolant, thermostat, and related components for optimal engine temperature management.
Chassis Frame:
Details on frame inspection, welding points, and associated chassis components for structural integrity.
Bodywork Plastics:
Covers removal, installation, and maintenance of body panels, fenders, and other plastic components.
Routine Maintenance:
Covers all scheduled maintenance tasks, including oil changes, filter replacements, chain adjustments, and inspections.
Troubleshooting:
Systematic diagnostic procedures for identifying and resolving common and complex problems across all vehicle systems.
Engine Rebuild:
Detailed step-by-step instructions for engine disassembly, inspection, repair, and reassembly.
Electrical Diagnostics:
Utilizes wiring diagrams for pinpointing electrical faults, testing components, and repairing wiring harness issues.
Suspension Alignment:
Procedures for adjusting and maintaining suspension geometry for optimal handling and tire wear.
Brake System Overhaul:
Instructions for brake pad replacement, caliper service, master cylinder rebuilding, and brake line maintenance.
Pre Delivery Inspection:
Checklists and procedures for ensuring the ATV is properly prepared and inspected before customer delivery.
Depth Level:
Comprehensive
Diagnostic Capability:
Advanced diagnostic information, including fault codes (if applicable to the model) and component-specific testing.
Repair Scope:
Covers everything from minor adjustments to major component overhauls and system rebuilding.
Information Source:
Original factory-issued documentation used by authorized Yamaha technicians.
Engine Type:
4-stroke, SOHC, 4-valve
Bore X Stroke:
74.0 mm x 58.0 mm
Cooling System:
Liquid-cooled
Compression Ratio:
11.2:1
Horsepower Est:
Approximately 22-24 HP (at crankshaft, varies by source)
Torque Est:
Approximately 15-17 lb-ft (at crankshaft, varies by source)
Fuel Delivery:
Carburetor (Mikuni BSR33/1)
Fuel Type:
Unleaded gasoline
Ignition System:
CDI (Capacitor Discharge Ignition)
Oil Type Spec:
Yamalube 4 (or equivalent) SAE 10W-40 or 20W-40 API SG type or higher
Starting System:
Electric starter
Transmission Type:
5-speed manual with reverse
Transmission Options:
N/A (Manual transmission only)
Clutch Type:
Wet, multiple-disc
Final Drive:
O-ring sealed chain
Transmission Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 or 20W-40 API SG type or higher
Transmission Oil Capacity:
Approximately 1.00 L (1.06 US qt)
Safety Standards:
Designed to meet EPA and CARB emissions standards; operates under general ATV safety guidelines. No formal NHTSA crash ratings apply to ATVs.
Braking System Type:
Hydraulic disc brakes (front and rear)
Throttle Limiter:
Adjustable thumb throttle for beginner riders (typically adjusted by dealer or owner).
Handlebars Grip:
Anti-vibration handlebars and grips for rider comfort and control.
Footwells:
Wide, non-slip footwells for secure footing.
Engine Oil Change:
Every 1,000 km (600 miles) or 6 months, whichever comes first.
Air Filter Cleaning:
Inspect every 500 km (300 miles), clean as needed.
Spark Plug Replacement:
Every 5,000 km (3,000 miles) or replace if fouled.
Chain Adjustment:
Inspect and adjust every 500 km (300 miles) or as needed.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid
Coolant Type:
Yamaha Genuine Coolant (or equivalent) 50% mixture with distilled water
Common Wear Items:
Brake pads, chain and sprockets, wheel bearings, and suspension bushings are common wear items subject to regular inspection and replacement.
Carburetor Tuning:
Some owners may experience a need for carburetor fine-tuning based on altitude or modifications.
Electrical Connections:
As with many off-road vehicles, checking electrical connections for corrosion or looseness is recommended maintenance.
Manufacturer Focus:
Yamaha Motor Company is renowned for its high-performance engines and innovative powersports vehicles, including motorcycles, ATVs, and watercraft.
Previous Models:
The YFM250R built upon Yamaha's experience with other sport ATVs, offering a step up from smaller displacement models.
Production Period:
The YFM250R was produced for several model years, including 2008, 2009, and 2010, before being discontinued.
