Target Audience:
Big Bear 400 owners performing routine care, adjustments, and basic service on their ATV
Manual Purpose:
Factory-authorized operator guidance covering safe operation, periodic maintenance, and specifications
Illustrations:
Step-by-step instructions with detailed illustrations
Printable:
Printable from any computer and any printer
Source:
Yamaha factory documentation, best-quality reproduction
Delivery Method:
Instant download
Printing:
Fully printable from any computer and printer
Manual Type:
Owners Manual
Coverage Areas:
Operation, controls, pre-ride inspection, periodic maintenance, adjustments, and specifications
Instructions:
Detailed, illustrated, step-by-step
Engine:
Engine operation, break-in, and maintenance procedures
Fuel System:
Fuel tank, fuel cock, and carburetor servicing
Cooling:
Air-cooling system checks and maintenance
Lubrication:
Final gear oil, transmission oil, and lubrication points
Electrical:
Battery care, lighting, and fuse replacement
Brakes:
Front and rear brake inspection, adjustment, and pad check
Suspension:
Front suspension and rear shock inspection and adjustment
Wheels and Tires:
Tire pressure, inspection, and wheel removal/installation
Drive System:
4WD and drive shaft-related checks
Steering:
Steering system inspection and adjustment
Chassis:
Frame fasteners and general chassis checks
Body:
Seat removal, panel and bodywork servicing
Pre-Operation Checks:
Complete pre-ride inspection checklist
Periodic Maintenance:
Maintenance interval charts and procedures
Adjustments:
Throttle, cable, brake, carburetor, and drive chain/shaft adjustments
Troubleshooting:
Basic troubleshooting guides for starting and running issues
Storage:
Extended storage and after-storage procedures
Cleaning:
Care and cleaning guidance
Level:
Owner-level maintenance and adjustment; complex repairs referred to a Yamaha dealer
Specifications:
Factory torque values, fluid capacities, tire pressures, and electrical data
Illustrations:
Step-by-step illustrated instructions throughout
Parts Info:
Part numbers and specifications as listed in the factory manual; parts catalogs sold separately
Replacement Parts:
Recommendation to use genuine Yamaha parts and approved accessories
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Primary Engine:
Single-cylinder 4-stroke air-cooled
Displacement:
Approximately 400 cc class
Valvetrain:
Overhead valve design
Starting System:
Electric start with auxiliary recoil starter
Fuel System:
Carbureted, gravity-fed fuel system
Fuel Type:
Regular unleaded gasoline
Detailed Tuning Figures:
N/A - owners manual lists basic specifications only; consult service manual for full tuning data
Standard Transmission:
Wide-range continuously variable transmission (V-belt automatic) with high/low range
Optional Transmission:
N/A - single factory configuration for this model
Drive:
Shaft drive, selectable 2WD/4WD
Gear Selector:
High, Low, Neutral, Reverse ranges
Wheelbase:
Approximately 1,210 mm (47.6 in)
Length:
Approximately 1,945 mm (76.6 in)
Width:
Approximately 1,095 mm (43.1 in)
Ground Clearance:
Approximately 200 mm (7.9 in)
Seat Height:
Approximately 825 mm (32.5 in)
Curb Weight:
Approximately 265 kg (584 lb)
Maximum Load:
See manual for rated load capacity including racks and riders
Brakes:
Hydraulic front disc brakes and sealed rear drum brake
Lighting:
Headlight and taillight/brake light
Parking Brake:
Parking brake mechanism with indicator
Footrests:
Wide, textured footrests for secure footing
Frame:
Steel tube frame design
Operator Guidance:
Manual includes extensive riding-safety, load-carrying, and warning labels section
Crash Test Information:
N/A - ATVs are not assigned crash-test ratings
Instrument Panel:
Speedometer with odometer, fuel gauge, and indicator/warning lights
Indicators:
Neutral, reverse, and parking brake indicators
Infotainment and Assistance
Audio System:
N/A - not equipped on this ATV
Driver Assistance:
N/A - not applicable to this vehicle type
Interval Chart:
Full periodic maintenance chart in the manual (initial break-in and recurring intervals)
Pre-Ride:
Pre-operation inspection required before every ride
Engine Oil:
Yamaha-specified 4-stroke engine oil; capacity and grade listed in manual
Final Gear Oil:
Hypoid gear oil API GL-4 or GL-5, SAE 80 or 80W-90 as specified
Transmission Oil:
Specified grade and capacity listed in manual
Brake Pads:
Regular pad wear inspection required
Air Filter:
Frequent cleaning required, especially in dusty conditions
Spark Plug:
Periodic inspection and gap check
Tires:
Pressure and tread wear checks before each ride
Cables:
Throttle and brake cable lubrication and free-play adjustment
Manufacturer:
Yamaha Motor Company, established manufacturer of motorcycles, ATVs, and powersports products
Big Bear Lineage:
Big Bear introduced in the late 1980s as a utility 4x4 ATV; the 2002 YFM400P continued the utility-oriented shaft-drive design with electric start and selectable 4WD
Production Location:
N/A - not specified in the owners manual
