Target Audience:
Yamaha YFM 250 Moto-4 owners, technicians, and enthusiasts
Key Differentiator:
Enhanced PDF features (bookmarks, sub-bookmarks), comprehensive coverage, instant download, cross-platform compatibility
Ease Of Use:
Designed to avoid sifting through hundreds of pages due to organized structure and digital indexing
Authenticity:
Represents the same manual used by factory-trained mechanics
Satisfaction Guarantee:
Satisfaction guaranteed or money back
Manual Type:
Factory Repair Manual
Primary Coverage:
Service, maintenance, and repair
Format:
Improved PDF (Bookmarks, Sub-bookmarks, Index)
Digital Features:
Printable pages, Backup CD burnable
Compatibility:
All Windows, All Mac, All Linux
Download Availability:
Instant Download
Estimated Pages:
Hundreds
Engine:
Complete engine service, overhaul, and diagnostics
Cooling System:
Radiator, hoses, thermostat, fan (if applicable), coolant specifications
Fuel System:
Carburetor (or Fuel Injection System as stated), fuel pump, fuel lines, filter replacement
Drive Train:
Transmission, final drive, driveshaft, differential (if applicable), clutches
Chassis:
Frame, suspension (front and rear), steering system, wheels, tires
Electrical System:
Battery, charging system (stator, rectifier/regulator), ignition system, starter, lighting, instruments
Brakes:
Hydraulic system (master cylinder, calipers, lines), brake pad replacement, bleeding procedures
Bodywork:
Body panels, fenders, seat, handlebars, controls
General Information:
Vehicle identification, safety precautions, shop practices
Periodic Checks Adjustments:
Scheduled maintenance, fluid level checks, cable adjustments, chain tensioning
Troubleshooting:
Diagnostic procedures for common problems, symptom-based troubleshooting guides
Repair Procedures:
Step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation
Technical Depth:
Comprehensive, suitable for professional mechanics and advanced DIY enthusiasts
Diagrams Illustrations:
Extensive diagrams and illustrations for clarity
Engine Type:
Four-stroke, SOHC, Air-Cooled (typical for this era and model)
Displacement:
230cc to 246cc (typical for a 250cc class engine of this period)
Bore X Stroke:
Specific values to be found in the manual (e.g., 66.0 mm x 70.0 mm for similar Yamaha engines)
Compression Ratio:
Specific values to be found in the manual (e.g., 9.2:1)
Horsepower:
Estimated 15-20 HP (typical for class, specific value in manual)
Torque:
Specific values to be found in the manual
Fuel Delivery:
Carburetor (Mikuni VM series common for this model, e.g., VM26SS)
Carburetor Size:
Specific size to be found in the manual (e.g., 26mm)
Recommended Fuel:
Unleaded gasoline (Octane rating to be specified in manual)
Transmission Type:
5-speed manual with automatic clutch (Torque-Shift System)
Optional Transmission:
N/A
Drive:
Shaft drive to rear wheels (typical for Moto-4 series)
Gear Ratios:
Detailed gear ratios provided in the manual
Transmission Fluid Type:
Yamaha's recommended gear oil or equivalent (specific type and quantity in manual)
Overall Length:
Specific dimensions available in manual
Overall Width:
Specific dimensions available in manual
Overall Height:
Specific dimensions available in manual
Dry Weight:
Approximately 200-220 kg (typical for model, specific value in manual)
Fuel Capacity:
Approximately 9-10 Liters (typical for model, specific value in manual)
Towing Capacity:
N/A for this model classification
Safety Ratings:
Not typically rated by agencies like NHTSA or IIHS for ATVs of this era
Braking System:
Dual front disc brakes, single rear drum or disc brake
Lighting:
Headlight, taillight, brake light
Chassis Design:
Robust frame construction for off-road use
Operator Controls:
Ergonomic handlebar and control layout
Oil Change Interval:
Typically every 3,000 km or 6 months (specifics in manual)
Air Filter Cleaning:
Recommended at regular intervals, depending on operating conditions (e.g., every 1,000 km)
Spark Plug Replacement:
Specific interval provided in manual (e.g., every 10,000 km)
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-30 or 20W-40 API SE or SF) - specific viscosity based on ambient temperature
Engine Oil Capacity:
Approximately 1.7 - 1.9 Liters (with filter change) - specific value in manual
Coolant Type:
Ethylene glycol based antifreeze (50% mixture with distilled water) - specific type and capacity in manual
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid
Common Wear Items:
Brake pads, tires, battery, carburetor adjustments, suspension bushings
Carburetor Performance:
Can require periodic cleaning and adjustment due to fuel quality or debris ingress
Electrical Connections:
Corrosion in connectors can lead to intermittent electrical faults, especially in wet environments
Brand History:
Yamaha Corporation is a Japanese multinational corporation that manufactures a wide range of products, including motorcycles, musical instruments, and powersports vehicles. They have a long-standing reputation for quality and innovation in the ATV market.
Moto 4 Lineage:
The Moto-4 series was Yamaha's line of utility and recreational ATVs in the late 1980s and early 1990s, known for their reliability and capable performance. The YFM 250 was a popular mid-size offering.
Production Period:
The YFM 250 Moto-4 was produced for several years, with the manual covering the 1989-1991 model years. It was part of a broader generation of Yamaha ATVs.
