Vehicle Segment:
ATV (All-Terrain Vehicle)
Key Competitors:
Polaris Sportsman, Honda Foreman, Kawasaki Prairie, Suzuki King Quad.
Vehicle Purpose:
Designed for utility and recreational trail riding, offering a balance of power and comfort.
Manual Benefit:
Empowers owners and technicians to perform accurate diagnostics and repairs, ensuring optimal performance and longevity.
Engine System:
Comprehensive coverage of engine disassembly, assembly, diagnostics, and tuning.
Transmission System:
Detailed procedures for the automatic transmission, including fluid checks, adjustments, and overhaul.
Chassis And Suspension:
Includes front and rear suspension, steering, and frame components.
Braking System:
Covers hydraulic brake system, including front and rear brake calipers, master cylinder, and bleeding procedures.
Electrical System:
Extensive coverage of the electrical system, including wiring diagrams, component testing, battery, charging system, ignition, and lighting.
Fuel System:
Details on fuel tank, fuel pump, carburetor (or EFI system), and fuel lines.
Cooling System:
Information on radiator, cooling fan, hoses, and thermostat.
Exhaust System:
Coverage of exhaust pipes, muffler, and heat shields.
Body And Trim:
Procedures for removing and installing body panels, fenders, and seats.
Maintenance Procedures:
Routine maintenance tasks such as oil changes, filter replacements, spark plug service, and lubrication.
Troubleshooting Guides:
Systematic troubleshooting charts for common operational problems and diagnostic procedures.
Repair And Rebuild:
Step-by-step instructions for component repair and full system rebuilds.
Diagnostics:
Detailed diagnostic steps for identifying malfunctions using various tools and techniques.
Wiring Diagrams:
Complete and detailed electrical system wiring diagrams.
Torque Specifications:
Precise torque values for critical fasteners across all systems.
Special Tools:
Identification and usage instructions for any specialized tools required for specific repairs.
Depth Level:
Comprehensive Workshop Manual
Diagnostic Capabilities:
Advanced diagnostic procedures for in-depth troubleshooting.
Rebuild Scope:
Full engine and transmission rebuild procedures.
Engine Type:
4-Stroke, SOHC, Air-Cooled
Displacement:
392cc (23.9 cu. in.)
Bore X Stroke:
85.0 mm x 70.0 mm (3.35 in. x 2.76 in.)
Carburetor:
Mikuni BSR33/1, 33 mm
Ignition:
CDI (Capacitor Discharge Ignition)
Estimated Horsepower:
Approx. 23 HP @ 6000 RPM
Estimated Torque:
Approx. 26 lb-ft @ 4500 RPM
Fuel Type:
Unleaded Gasoline
Fuel Tank Capacity:
3.2 US gal (12 L)
Transmission Type:
Automatic (Yamaha Constant Velocity Transmission - Y-CVT)
Drive System:
Shaft Drive (4x4 models: On-Command 2WD/4WD with Diff Lock)
Gear Selection:
High, Low, Neutral, Reverse
Transmission Fluid Type:
Yamalube 4 (or equivalent SAE 10W-30 API SG type motor oil)
Transmission Fluid Capacity:
Approx. 1.7 L (1.8 US qt)
Atv Safety Standards:
Compliance with applicable ANSI/SVIA safety standards for ATVs.
Braking Type:
Hydraulic Disc Brakes (Front and Rear)
Lighting:
Dual 30W Krypton headlights, 30/30W brake/taillight.
Tyre Specifications:
Front: AT25x8-12, Rear: AT25x10-12 (Typical)
Engine Oil Change:
Every 3000 km or 6 months, whichever comes first (refer to manual for specific conditions).
Air Filter Cleaning:
Every 1000 km or 6 months (more frequently in dusty conditions).
Spark Plug Check:
Every 2000 km or 12 months.
Valve Clearance Check:
Every 4000 km or 24 months.
Engine Oil Specification:
Yamalube 4 (or equivalent SAE 10W-30 API SG type motor oil)
Engine Oil Capacity:
Approx. 1.7 L (1.8 US qt) without filter change, 1.9 L (2.0 US qt) with filter change.
Coolant Type:
Yamaha Coolant (or equivalent ethylene glycol-based antifreeze with distilled water)
Common Wear Items:
Brake pads, wheel bearings, drive belts (in CVT), suspension bushings.
Potential Electrical:
Wiring harness integrity, stator output (though generally reliable).
Manufacturer History:
Yamaha Motor Company is a Japanese manufacturer of motorcycles, marine products, and other motorized products, known for its innovation and quality.
Model Introduction:
The YFM400 Grizzly was introduced as Yamaha's offering in the mid-size utility ATV segment, evolving from earlier models like the Timberwolf.
Production Years:
Typically produced from the early 2000s onwards, with variations in specific model codes (e.g., YFM400FWAM indicating a specific year/spec).
