Target Audience:
Farm, ranch, and recreational riders needing a compact, easy-to-handle 4x4 utility ATV
Segment:
Entry-level 4WD utility ATV
Key Advantage:
Compact size, low seat height, and simple air-cooled engine make maintenance straightforward
Competitors:
Honda FourTrax 250, Suzuki QuadRunner 250, Kawasaki Bayou 250
Drivetrain:
Shaft-driven four-wheel drive
Engine:
Air-cooled 230cc single-cylinder four-stroke
Coverage Areas:
Engine, fuel, drive train, chassis, electrical, and troubleshooting for YFB250 4WD models
Manual Type:
Factory-style service / repair manual
Delivery Method:
Instant digital download
Binding:
Digital (PDF document)
Engine:
Cylinder head, valves, piston, crankshaft, oil pump, recoil starter
Fuel System:
Carburetor, fuel tank, throttle, air intake
Drive Train:
Clutch, transmission, shift mechanism, front and final drive shafts, differentials
Chassis:
Front and rear suspension, wheels, brakes, steering, frame
Electrical:
Ignition system, starting system, charging system, lighting, switches, wiring diagrams
Cooling:
Air-cooled engine, cooling fin inspection and cleaning
Exhaust:
Muffler and exhaust pipe removal, inspection, spark arrestor
Troubleshooting:
Symptom-based diagnostics for engine, drive, chassis, and electrical faults
Periodic Maintenance:
Service schedules, tune-up, valve adjustment, oil change
Adjustments:
Carburetor, throttle, brakes, drive chain/shaft play, tire pressure
Overhaul:
Complete step-by-step disassembly, inspection limits, and reassembly
Torque Specifications:
Fastener torque values throughout all chapters
Depth:
Full workshop-level detail for professional technicians and DIY owners
Illustrations:
Diagrams, exploded views, and photos for all major assemblies
Specifications:
Complete service specifications and wear limits tables
Part Numbers:
Part numbers referenced in exploded diagrams where applicable
Replacement Parts:
Gaskets, seals, bearings, and wear items identified during overhaul procedures
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
Wheelbase:
Approximately 1,165 mm (45.9 in)
Overall Length:
Approximately 1,805 mm (71 in)
Overall Width:
Approximately 990 mm (39 in)
Seat Height:
Approximately 770 mm (30.3 in)
Ground Clearance:
Approximately 145 mm (5.7 in)
Curb Weight:
Approximately 220 kg (485 lb)
Crash Test Ratings:
N/A - ATVs are not crash tested by consumer rating agencies
Brakes:
Front dual drum brakes, rear sealed drum brake
Lighting:
Headlight and taillight standard
Passive Features:
Foot guards, standard ATV handlebar and footpeg layout
Engine Oil:
Replace every 100 hours or 6 months; check before each ride
Valve Clearance:
Check/adjust periodically per schedule
Air Filter:
Clean frequently, especially in dusty conditions
Engine Oil:
SAE 10W-30 API SE or higher, 4-stroke motorcycle oil
Known Issues / Common Wear Items
Common Wear:
Brake shoes, drive shaft boot wear, carburetor gumming from storage
Maintenance Note:
Shaft drive eliminates chain lubrication but requires periodic oil level checks in drive cases
Manufacturer:
Yamaha Motor Company, Japan
Brand Heritage:
Yamaha entered the ATV market in the early 1980s and built the Timberwolf as a durable compact utility machine
Model Evolution:
Timberwolf YFB250 was introduced in the early 1990s; the 4WD version added front drive with shaft propulsion; produced through 2001 before being replaced by Yamaha's newer Big Bear line
Production Location:
Japan
