Diagnosing starting issues, lighting problems, charging system faults using provided wiring diagrams.
Diagnostic Procedures:
Step-by-step guides for identifying and resolving common issues.
Assembly Disassembly:
Detailed instructions for taking apart and putting back together all major components.
Technical Depth
Depth:
Extremely High - Covers everything from basic maintenance to complete engine and transmission rebuilds, including diagnostics and component-level repair.
Diagrams Illustrations:
Includes exploded views, diagrams, schematics, and step-by-step illustrations for clarity.
Specifications:
Detailed technical specifications, torque values, clearances, fluid types, and capacities.
📊 Manual Specifications
File Format
File Type:
PDF (Portable Document Format)
Searchability:
Likely text-searchable PDF for efficient information retrieval.
Print Quality
Resolution:
High resolution, suitable for printing at home or professionally.
Binding Type
Binding:
N/A (Digital Download)
Paper Type
Paper:
N/A (Digital Download)
⚙️ Engine Specifications
Primary Engine 350
Engine Type:
4-stroke, SOHC, 2-valve, single-cylinder
Displacement Cc:
348cc
Bore X Stroke:
83.0 mm x 64.5 mm
Cooling System:
Liquid-cooled
Compression Ratio:
9.2:1
Primary Engine 400
Engine Type:
4-stroke, SOHC, 4-valve, single-cylinder
Displacement Cc:
401cc (for some models, check specific variant)
Cooling System:
Liquid-cooled
Performance
Horsepower Approx 350:
Approx. 20-25 hp (varies by tuning and model year)
Torque Approx 350:
Approx. 22-27 Nm (varies)
Fuel System
Fuel Delivery 350:
Carburetor (e.g., Mikuni BSR33/34)
Fuel Capacity:
Approx. 3.3 gallons (12.5 L) including reserve
Ignition
Ignition System:
Digital CDI
Starter
Starting System:
Electric starter
🔧 Transmission
Standard
Transmission Type:
Automatic (Yamaha Ultramatic CVT)
Drive System:
Shaft drive (2WD/4WD selectable)
Gear Reduction:
Differential gears (front and rear)
Features
Cv Features:
Engine braking, automatic adjustment to terrain and load.
Fluid Specifications
Gear Oil Type:
Yamalube Gear Oil SAE 80W-90 (or equivalent API GL-4)
Differential Oil Type:
Yamalube Gear Oil SAE 80W-90 (or equivalent API GL-4)
📐 Dimensions
Exterior
Length:
Approx. 76.2 inches (1935 mm)
Width:
Approx. 43.7 inches (1110 mm)
Height:
Approx. 43.5 inches (1105 mm)
Weights
Dry Weight:
Approx. 575 lbs (261 kg)
Curb Weight:
Approx. 600+ lbs (272+ kg)
Cargo
Front Rack Capacity:
Approx. 88 lbs (40 kg)
Rear Rack Capacity:
Approx. 176 lbs (80 kg)
Wheels Tires
Front Tire Size:
AT25x8-12
Rear Tire Size:
AT25x10-12
Wheel Bolt Pattern:
4x110 mm (typical for Yamaha ATVs)
🛡️ Safety Features
Ratings
Atv Safety Standards:
Complies with ANSI/SVIA standards.
Active Features
Braking System:
Hydraulic disc brakes (front and rear), Parking brake.
4Wd System:
On-Command 2WD/4WD system.
Passive Features
Handlebars:
Ergonomic handlebars with thumb throttle and hand brake levers.
Lighting:
Dual halogen headlights, taillight/brake light.
💡 Technology Features
Infotainment
Infotainment System:
N/A (Utility ATV, typically no integrated infotainment).
Driver Assistance
Driver Assistance Features:
N/A (Basic utility ATV design).
Connectivity
Connectivity Features:
N/A (Basic utility ATV design).
🔧 Maintenance
Service Intervals
Engine Oil Change:
Every 1,000 km or 6 months, whichever comes first (refer to manual for precise interval).
Air Filter Cleaning:
Every 3 months or 500 km, inspect more frequently in dusty conditions.
Spark Plug Replacement:
Check every 1,000 km, replace as needed or per manual schedule.
Cv Belt Inspection:
Inspect every 1,000 km or 6 months for wear and damage.
Fluid Specifications
Engine Oil Type:
Yamalube 4 (10W-40) or equivalent API SG, JASO MA.
Engine Oil Capacity:
Approx. 2.0-2.1 L (with oil filter change)
Coolant Type:
Permanent type antifreeze (ethylene glycol based, 50/50 mix with distilled water).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Known Issues
Cv Belt Wear:
Like all CVTs, drive belts can wear over time and require replacement. Proper maintenance and avoiding excessive strain can prolong belt life.
Carburetor Cleaning:
Carburetors can sometimes require cleaning or adjustment due to fuel varnish or debris, especially if the ATV sits for extended periods.
Suspension Bushings:
Like many ATVs of this era, suspension bushings can degrade over time, leading to play and requiring replacement.
📚 Vehicle History
Brand Heritage
Yamaha Atv Legacy:
Yamaha has a long-standing reputation for producing reliable and high-performance off-road vehicles.
Model Evolution
Bruin Introduction:
The Bruin line was introduced as Yamaha's mid-size utility ATV, offering a balance of power, comfort, and capability.
Production
Manufacturing Location:
Primarily manufactured in Japan or USA.
🏆 Awards & Recognition
Recognitions
Atv Industry Recognition:
While specific awards for the Bruin are not widely publicized, Yamaha's ATV line is consistently recognized for reliability and performance in its class.
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