Vehicle Class:
Mid-size All-Terrain Vehicle (ATV)
Key Competitors:
Honda FourTrax/Rancher, Suzuki King Quad, Polaris Sportsman, Kawasaki Prairie/Brute Force.
Manual Selling Points:
Instant download, step-by-step diagrams, comprehensive coverage, model-specific accuracy, PC/MAC compatible, secure payment options.
Target Audience:
ATV owners, DIY mechanics, service shops seeking detailed repair information.
Engine Systems:
Engine removal/installation, cylinder head/valve service, cylinder/piston overhaul, lubrication, fuel system diagnosis and repair, ignition system, electric starter.
Drivetrain Systems:
Clutch service, gearshift linkage adjustment, sub-transmission overhaul, main transmission service, crankshaft and primary shaft inspection.
Chassis Suspension Brakes:
Front wheel and suspension service, rear wheel and suspension service, hydraulic brake system repair and bleeding.
Electrical Systems:
Battery and charging system, ignition system, electric starter system, switches, electrical diagrams.
Maintenance Procedures:
Routine inspections, lubrication, fluid changes, filter replacements, adjustments.
Repair Procedures:
Engine rebuilding, transmission overhauls, suspension component replacement, brake system repairs, electrical component troubleshooting and replacement.
Troubleshooting Guides:
Detailed guides for diagnosing and resolving common and uncommon mechanical and electrical issues.
Depth Of Coverage:
Detailed step-by-step instructions, diagrams, specifications, and procedures for complete engine and component rebuilding, advanced diagnostics, and routine maintenance.
Engine Type 350:
4-stroke, SOHC, 2-valve, air-cooled
Bore X Stroke 350:
83.0 mm x 64.5 mm
Compression Ratio 350:
Approximately 9.2:1 (verify specific model)
Engine Type 400:
4-stroke, SOHC, 4-valve, liquid-cooled (typically)
Displacement 400:
Approximately 367cc (verify specific model, may have variations)
Horsepower Range:
Estimated 20-25 HP (varies by specific model and tuning).
Fuel Delivery 350:
Carburetor (e.g., Mikuni BSR33)
Fuel Delivery 400:
Carburetor or Fuel Injection (depending on specific 400 variant, e.g., 400FA might have FI)
Engine Oil Capacity:
Approximately 1.8 - 2.0 Liters (including oil filter change). Exact specification will be in manual.
Type:
Automatic (Continuously Variable Transmission - CVT)
Features:
Shaft drive, selectable 2WD/4WD, high/low range forward gears, reverse.
Cvt Fluid:
Specific Yamaha CVT fluid or equivalent is critical. Manual will specify part number and type.
Final Drive Oil Type:
Yamalube Hypoid Gear Oil GL-4 80W-90 or equivalent. Manual will specify.
Length:
Approx. 76.8 inches (1950 mm) for 350. 400 may vary slightly.
Width:
Approx. 42.5 inches (1080 mm) for 350. 400 may vary slightly.
Height:
Approx. 45.3 inches (1150 mm) for 350. 400 may vary slightly.
Wheelbase:
Approx. 48.8 inches (1240 mm) for 350. 400 may vary slightly.
Ground Clearance:
Approx. 7.1 inches (180 mm) or more. Manual will provide precise measurement.
Dry Weight:
Approx. 538 lbs (244 kg) for 350. 400 may vary.
Wet Weight:
Approx. 573 lbs (260 kg) for 350. Manual will specify with fluids.
Towing Capacity:
Typically rated at 990 lbs (450 kg) for models of this era. Manual will confirm.
Rack Capacity Front:
Approximately 88 lbs (40 kg) (verify specific model)
Rack Capacity Rear:
Approximately 176 lbs (80 kg) (verify specific model)
Atv Safety Standards:
Manufactured to meet relevant ATV safety standards of the era. Manual may reference specific guidelines.
Braking System:
Hydraulic disc brakes front and rear.
Drivetrain Selection:
Selectable 2WD/4WD for enhanced traction.
Design Considerations:
Low center of gravity, wide stance, ergonomic seating for stability and control.
Instrument Cluster:
Digital LCD display showing speedometer, odometer, trip meter, fuel gauge (if equipped), 2WD/4WD indicator, gear indicator, engine hour meter.
4Wd System:
Push-button or lever-actuated selectable 4WD with differential lock (depending on specific model).
Charging System:
12V DC system, stator-based charging, with DC outlet for accessories (often optional or integrated).
Oil Change Interval:
Every 3,000 km or 100 hours of operation, or annually. Manual will specify exact interval.
Air Filter Cleaning:
Regular inspection and cleaning, especially in dusty conditions. Replacement interval as needed.
Spark Plug Replacement:
Typically every 6,000 km or 200 hours. Manual will provide specific plug type and gap.
Valve Clearance Adjustment:
Recommended initial check at 1000 km, then at 6,000 km intervals. Manual will provide exact specs.
Engine Oil Grade:
Yamalube 4 (API SG, SAE 10W-40) or equivalent. Manual will confirm.
Coolant Type 400:
Yamaha All-Weather engine coolant or equivalent ethylene glycol-based coolant with corrosion inhibitors. Manual will specify ratio.
Common Wear Items:
Brake pads, wheel bearings, CV joint boots, battery, drive belt (CVT).
Potential Engine Concerns:
Carburetor jetting and cleaning can be important for consistent performance. Valve adjustments are crucial for engine longevity.
Typical Drivetrain Wear:
CVT drive belts can wear over time and require replacement. Proper maintenance of final drive oil is essential.
Yamaha Atv Legacy:
Yamaha has a long history of producing reliable and capable ATVs, starting with the Tri-Moto and expanding into 4-wheel models with innovation in suspension and drivetrains.
Bruin Lineage:
The Bruin line replaced or ran concurrently with models like the Timberwolf and Big Bear, offering a blend of utility and recreational features. The 350 was a popular mid-size offering, while the 400 variants provided more power and features.
Manufacturing Location:
Primarily Japan, with potential assembly in other Yamaha facilities.
