Atv Segment:
Mid-size utility ATV, known for its reliability and capability in various terrains.
Competitors:
Competed with models like Honda Foreman, Suzuki King Quad, and Polaris Sportsman of similar displacement.
Engine Type:
Liquid-cooled, four-stroke, SOHC engine.
Drivetrain Type:
Shaft drive, with selectable 2WD/4WD and differential lock options.
Suspension Type:
Independent front suspension (IFS) and swingarm rear suspension.
Engine:
Complete engine disassembly, assembly, tuning, diagnostics, and repair for all sub-systems (carburetor, ignition, cooling, lubrication).
Transmission:
Automatic transmission (CVT) inspection, service, repair, and adjustment, including belt inspection and replacement.
Drivetrain:
Front and rear differential, driveshafts, universal joints, wheel hubs, and bearings.
Suspension:
Front and rear suspension components, shock absorbers, springs, control arms, bushings, and alignment procedures.
Brakes:
Front and rear brake systems, hydraulic lines, calipers, brake pads, rotors, bleeding procedures, and parking brake.
Steering:
Steering column, tie rods, ball joints, and steering knuckle maintenance and repair.
Electrical:
Wiring diagrams, battery, starter, charging system (alternator/stator), lighting system, ignition system, and accessory circuits.
Fuel System:
Fuel tank, fuel lines, fuel pump, and carburetor (Mikuni BST series typical) overhaul and adjustment.
Cooling System:
Radiator, fan, coolant hoses, thermostat, and coolant specifications.
Bodywork:
Frame, body panels, fenders, seat, handlebars, and minor body repair procedures.
Preventative Maintenance:
Detailed procedures for routine maintenance, including oil changes, filter replacements, lubrication, and inspections.
Troubleshooting:
Comprehensive diagnostic charts and procedures for identifying and resolving common and uncommon problems.
Repair Procedures:
Step-by-step instructions for component removal, installation, overhaul, and replacement.
Special Tools:
Identification and usage of specialized tools required for specific repair or maintenance tasks.
Torque Specifications:
Precise torque values for all critical fasteners and components.
Wiring Diagrams:
Detailed, color-coded wiring diagrams for all electrical systems.
Depth Level:
In-depth, from basic maintenance to complete engine and transmission rebuilds.
Diagnostic Capability:
Advanced diagnostic procedures for electrical and mechanical issues.
Engine Type:
4-stroke, SOHC, liquid-cooled, single-cylinder
Bore X Stroke:
82mm x 71.2mm (Typical for this generation)
Compression Ratio:
9.2:1 (Typical)
Horsepower:
Approx. 21-23 HP @ 5500 RPM (Estimate, varies by tuning and specific model year)
Torque:
Approx. 23-25 lb-ft @ 4500 RPM (Estimate)
Fuel Delivery:
Mikuni BSR33/BSR34 carburetor (typically)
Fuel Type:
Unleaded gasoline, 87 octane minimum
Ignition System:
CDI (Capacitor Discharge Ignition)
Oil Type:
Yamalube 4 (or equivalent 10W-40 API SG or higher)
Oil Capacity:
Approx. 2.5 L (with filter change) - Refer to manual for precise capacity
Length:
Approx. 78.3 inches (1989 mm) - Varies slightly by year
Width:
Approx. 41.7 inches (1059 mm) - Varies slightly by year
Height:
Approx. 45.5 inches (1156 mm) - Varies slightly by year
Wheelbase:
Approx. 49.2 inches (1250 mm) - Varies slightly by year
Dry Weight:
Approx. 573 lbs (260 kg) - Varies slightly by year
Towing Capacity:
Refer to manual for specific towing capacity, typically around 1100 lbs (500 kg)
Ground Clearance:
Approx. 10.4 inches (264 mm) - Varies slightly by year
Front Tire Size:
AT25x8-12 (Typical)
Rear Tire Size:
AT25x10-12 (Typical)
Bolt Pattern:
4/110 (Typical for Yamaha ATVs)
Engine Oil Change:
Every 1000 km or 6 months, whichever comes first (typical).
Air Filter Cleaning:
Every 500 km or 6 months, replace as needed (typical).
Spark Plug Inspection:
Every 2000 km or 12 months (typical).
Cv Belt Inspection:
Every 1000 km or 6 months, replace as needed (critical for CVT health).
Engine Oil:
Yamalube 4 (or equivalent) SAE 10W-40 API SG, JASO MA.
Transmission Fluid:
Yamaha Gear Oil (or equivalent 80W-90 API GL-4) for front/rear differentials.
Coolant:
Permanent type antifreeze (ethylene glycol based) mixed 50:50 with distilled water.
Carburetor Icing:
Can be susceptible to icing in cold, humid conditions, addressed by carburetor modifications or de-icing additives.
Cv Belt Wear:
Regular inspection and replacement of the CVT belt is crucial to prevent catastrophic failure.
Front Axle Boot Wear:
Front axle boots can be prone to tears from debris, leading to joint damage if not maintained.
Starter Drive Issues:
Some models may experience wear on the starter drive mechanism, requiring replacement.
Yamaha Atv History:
Yamaha has a long-standing reputation for producing durable and capable ATVs since the 1980s, with the Kodiak line being a cornerstone of their utility offerings.
Kodiak 400 Lineage:
The Kodiak 400 was introduced in 1995 as a successor to the Wolverine 4x4, featuring more robust utility features. It evolved with independent front suspension and other refinements throughout its production run.
Production Years:
1995-2006 (This manual likely covers a specific range within these years, potentially 1995-2002 or a broader segment depending on the exact YFM400FAT designation).
