Category:
Mid-size utility ATV, aimed at recreational users and light farm/ranch work.
Competitors:
Competed against similar models from Honda (e.g., FourTrax 300), Suzuki (e.g., QuadSport 250), and Kawasaki (e.g., Bayou 250).
Features:
Known for its reliable air-cooled engine, comfortable riding position, and capable suspension for its class. Often praised for its ease of use and affordability.
Value:
The manual offers essential knowledge for safe and effective operation, basic maintenance, and troubleshooting, enhancing the ownership experience and longevity of the ATV.
Overall Scope:
Comprehensive coverage of operation, safety, maintenance, and troubleshooting for the 1998 Yamaha YFB250 Timberwolf.
Specific Topics:
Machine identification, control functions, safety information, starting procedures, operation techniques, maintenance, troubleshooting, and specifications.
Estimated Pages:
Estimated 100-150 pages based on typical owner's manual content and detail level.
Delivery Method:
PDF Download
Compatibility:
Compatible with All Versions of Windows & Mac
Software Requirement:
Adobe PDF Reader
Engine:
Starting procedures (cold/warm), warming up, fuel system, engine oil, and lubrication.
Drivetrain:
Drive select lever operation, shifting, transfer gear oil, final gear oil, and differential gear oil.
Brakes:
Front brake lever, rear brake pedal and lever, parking brake, front and rear brake shoe inspection, and brake adjustment (lever free play, rear brake).
Controls And Indicators:
Main switch, indicator lights, handlebar switches, throttle lever, speed limiter, and starter choke.
Chassis And Suspension:
Seat, storage box, front carrier, rear carrier, and rear shock absorber adjustment.
Electrical:
Battery, fuse replacement, headlight beam adjustment, and replacing headlight bulb.
Operation And Riding:
Getting to know your machine, pre-operation checks, riding your vehicle, starting out and accelerating, decelerating, turning, climbing uphill, riding downhill, crossing a slope, crossing shallow water, riding over rough terrain, reverse driving, and parking (including on a slope).
Maintenance:
Periodic maintenance, engine oil replacement, transfer gear oil replacement, final gear oil replacement, differential gear oil replacement, battery fluid replenishment, air filter cleaning, spark plug inspection, cable inspection, lubrication, and wheel removal/installation.
Troubleshooting:
Troubleshooting chart for common problems, carburetor adjustment, idle speed adjustment, valve clearance adjustment, and throttle lever adjustment.
Safety:
Important safety information, riding with care and good judgment, being careful where you ride, and understanding warning labels.
Depth:
Provides basic understanding of features and operation, essential safety information, and necessary skills for riding. Covers routine maintenance and common troubleshooting, but not in-depth repair or full disassembly instructions typically found in a service manual.
Type:
Four-stroke, SOHC, air-cooled
Bore X Stroke:
68.5 mm x 64.0 mm (typical for this engine family)
Compression Ratio:
9.0:1 (typical)
Carburetion:
Mikuni VM26 (typical for this model)
Ignition:
CDI (Capacitor Discharge Ignition)
Horsepower:
Approximately 16-18 HP (estimated for the era and displacement)
Torque:
Not explicitly stated in product info, but geared for low-end grunt.
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
Approximately 2.6 US gallons (9.8 L) (typical for this model)
Type:
5-speed manual with automatic clutch
Features:
Includes a reverse gear.
Optional Transmission:
N/A (Standard configuration)
Drive Select:
Selectable 2WD/4WD not available on this model; typically 2WD.
Transfer Gear Oil:
Manual specifies transfer gear oil replacement and provides specifications.
Final Gear Oil:
Manual specifies final gear oil replacement and provides specifications.
Length:
71.7 inches (1820 mm) (typical for the model)
Width:
41.7 inches (1059 mm) (typical for the model)
Height:
43.3 inches (1100 mm) (typical for the model)
Dry Weight:
Approximately 401 lbs (182 kg) (typical for the model)
Payload Capacity:
Not specified in product info, but designed for light loads.
Front Carrier Capacity:
Not specified, but typical for a utility ATV.
Rear Carrier Capacity:
Not specified, but typical for a utility ATV.
Crash Test Results:
N/A (ATVs are not typically crash-tested in the same manner as passenger vehicles).
Features:
Throttle limiter, dual-circuit hydraulic front disc brakes, sealed rear drum brake, engine braking.
Features:
Warning labels, comprehensive safety instructions within the manual, recommended safety gear (helmet, eye protection, etc.).
Engine Oil Change:
Typically every 100 hours or annually (refer to manual for exact intervals).
Air Filter Cleaning:
Regularly, especially in dusty conditions (refer to manual).
Spark Plug Inspection:
Typically at initial intervals and then periodically (refer to manual).
Engine Oil:
Yamaha recommends specific viscosity grades, likely SAE 10W-30 or 20W-40 (confirm in manual).
Transfer Gear Oil:
Yamaha recommends specific grades, often Yamalube or equivalent (confirm in manual).
Final Gear Oil:
Yamaha recommends specific grades, often Yamalube or equivalent (confirm in manual).
Differential Gear Oil:
N/A (This model typically uses a single rear drive unit, not a differential).
Common Problems:
Typical issues for ATVs of this age can include carburetor clogging if not properly stored, exhaust system wear, and general wear and tear on suspension and drivetrain components. The manual's troubleshooting section would address these.
Record Keeping:
Manual includes a section for a maintenance record to track services performed.
Heritage:
Yamaha has a long and successful history in powersports, known for its reliable engines and innovative designs across motorcycles, ATVs, and other recreational vehicles.
Evolution:
The Timberwolf line was a popular mid-size ATV for Yamaha, evolving through different engine sizes and features. The 1998 model represents a solid iteration of their utility-focused ATV offerings.
Production Period:
The Timberwolf series was produced for a significant period in the late 1990s and early 2000s.
