Target Audience:
Farm, ranch, and recreational riders needing a lightweight utility ATV
Class:
Entry-level mid-size utility ATV
Competitive Advantage:
Simple air-cooled single-cylinder design, electric start, and easy maintenance
Key Features:
229cc four-stroke engine, automatic clutch, shaft drive, rack storage
General Information:
Specifications, torque values, special tools, safety notices
Periodic Inspection:
Complete maintenance and lubrication charts with service intervals
Engine Removal:
Engine removal and installation procedures with torque specs
Cylinder Head:
Valve clearance inspection, adjustment, and reassembly
Cylinder and Piston:
Wear limits, piston ring end gap, bore measurement
Clutch:
Centrifugal automatic clutch inspection and replacement
Transmission:
Five-speed gearbox disassembly, inspection, and assembly
Final Drive:
Shaft drive inspection and gear case service
Carburetor:
Disassembly, jetting, float height, and tuning
Lubrication System:
Oil pump check, oil strainer, and oil change procedures
Cooling:
Air-cooled shroud and fin inspection
Fuel System:
Fuel tank, petcock, and fuel line service
Electrical:
Ignition system, CDI unit, and charging system testing
Starting System:
Electric starter, solenoid, and recoil starter service
Wiring Diagrams:
Complete color wiring schematics for 2WD and 4WD models
Front Suspension:
Strut and A-arm service with bushing replacement
Rear Suspension:
Swingarm bearings and shock inspection
Wheels and Brakes:
Drum brake service, cable adjustment, and tire specs
Steering:
Handlebar and steering linkage inspection and adjustment
Frame:
Frame fastener torque specs and bearing replacement
Troubleshooting:
Symptom-based fault diagnosis for all major systems
Technical Depth:
Step-by-step factory procedures with photos, diagrams, and wear limits
Parts Information:
OEM part numbers referenced throughout 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
Engine Type:
229cc air-cooled four-stroke single cylinder
Bore x Stroke:
70.0 mm x 59.6 mm
Compression Ratio:
Approximately 9.0:1
Valvetrain:
SOHC, 2 valves
Carburetor:
Mikuni constant-velocity slide carburetor
Fuel System:
Gasoline, gravity-fed from under-seat tank
Starting:
Electric start with auxiliary recoil
Rated Output:
N/A - not specified in this manual, refer to Yamaha spec sheet
Standard Transmission:
5-speed constant-mesh with automatic centrifugal clutch
Optional Transmission:
Same 5-speed; low range via dual-range transfer case on 4WD models
Drive System:
Shaft drive; 2WD on YFB250, selectable shaft-driven 4WD on YFB250FW
Final Drive:
Sealed shaft and bevel gear final drive
Wheelbase:
Approximately 1,195 mm (47.0 in)
Overall Length:
Approximately 1,815 mm (71.5 in)
Ground Clearance:
Approximately 150 mm (5.9 in)
Curb Weight:
Approximately 219 kg (483 lb) for 4WD model
Fuel Capacity:
Approximately 9.5 L (2.5 gal)
Tire Sizes:
Front 24 x 8-12, Rear 24 x 10-12
Crash Test Ratings:
N/A - ATVs are not crash tested like passenger vehicles
Passive Features:
Footwells with footpegs, rear grab bar, engine guard
Operator Aids:
Left-hand rear brake lever, parking brake, headlight and taillight
Recommended Gear:
Helmet, eye protection, gloves, and boots per manual safety notices
Audio System:
N/A - utility ATV, no factory audio
Instrumentation:
Speedometer with odometer, neutral and reverse indicators
Lighting:
Halogen headlight and integrated taillight/brake light
Driver Assistance:
N/A - not equipped on this model
Service Intervals and Fluids
Engine Oil:
Yamalube 4 or equivalent SAE 10W-30 SE-grade four-stroke oil
Oil Capacity:
Approximately 1.9 L (2.0 US qt) at oil change
Oil Change Interval:
Initial 1 month / 200 miles, then every 6 months / 600 miles
Valve Clearance:
Check periodically; approx 0.07-0.11 mm intake, 0.10-0.14 mm exhaust
Spark Plug:
DR8ES type, inspect every 6 months / 600 miles
Air Filter:
Foam element, clean every ride in dusty conditions
Final Gear Oil:
SAE 80 API GL-4 hypoid gear oil, check periodically
Common Wear Items:
Brake shoes, drive chain-free shaft couplings, swingarm bearings, carb boots
Known Issues:
Carburetor gumming from storage, worn recoil starters, stiff control cables
Manufacturer:
Yamaha Motor Company, founded 1955, Japan
Model Introduction:
Timberwolf introduced in 1989 as Yamaha's entry-level utility ATV
Model Evolution:
1995-1998 generation added refinements to suspension and styling; 4WD variant offered alongside base 2WD
Production Location:
Yamaha production facilities in Japan
