Yamaha Moto-4 100 YFM100 1987 1988 1989 1990 1991 Service Repair Manual

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Taper: Atv

Distributeur:

UGS: 91901

Mots clés: 1987 1988 1989 1990 1991 ATV Moto 4 Models Moto-4 100 YFM100 Powersports Yamaha

Variantes de produits

Description

This manual covers the Moto-4 (YFM100) model, specifically the first generation produced from 1987 to 1991. The Moto-4 is a practical and user-friendly All-Terrain Vehicle (ATV) designed for recreational riders and general utility tasks. Known for its reliable engine, compact size, and ease of operation, it offered a capable platform for light off-roading and farm use, competing with similar models from Honda, Suzuki, and Kawasaki during its production years. Its robust engineering ensures dependability for its intended applications. This comprehensive Service Repair Manual provides detailed, step-by-step instructions for the maintenance, repair, and troubleshooting of your Moto-4 YFM100. It covers all essential systems, including the engine, fuel system, transmission, drivetrain, suspension, steering, braking system, and electrical system. With clear illustrations and diagrams, this manual is an invaluable resource for professional technicians, mechanics, and DIY enthusiasts alike, ensuring the longevity and optimal performance of your vehicle through proper care and accurate repairs.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Moto-4

Model Code:

YFM100

Production Years Covered:

1987, 1988, 1989, 1990, 1991

Generation

Generation:

First Generation

👋 Introduction

Market Position

Market Segment:

Entry-level to mid-range ATV (All-Terrain Vehicle)

Target User:

Recreational riders, farm use, general utility

Competitive Analysis

Key Competitors Era:

Honda FourTrax, Suzuki QuadRunner, Kawasaki Bayou (similar displacement categories)

Key Features

Key Features Vehicle:

Compact size, user-friendly operation, reliable Yamaha engine, suitable for light off-roading and utility tasks

Key Features Manual:

Comprehensive coverage, detailed illustrations, troubleshooting guidance, DIY focus, instant download

📋 Manual Details

Coverage Areas

Covered Years:

1987-1991

Model Variants Covered:

YFM100 Moto-4

Page Count

Page Count:

Manual Type

Manual Type:

Service Repair Manual

Manual Source:

Original Manufacturer (implied)

Language

Language:

English

Format

Format:

Digital Download (PDF)

File Delivery:

Instant Download via Email/Checkout Page

File Compression:

May be zipped (.zip, .rar)

Software Requirements:

PDF Reader, Unzip Software (WinZip/WinRAR)

Compatibility:

Windows, Linux, Mac (all OS versions)

Print Quality

Print Quality:

Printable

Save Options:

Can be saved to any device (computer, iPad, hard disk)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Engine overhaul, cylinder, piston, crankshaft, connecting rod, valves, valve clearance, camshaft, lubrication, bore, stroke, compression ratio, ignition, magneto, stator, coil, spark plug

Fuel System:

Carburetor (Carburettor), pilot jet, main jet, mixture screw, fuel pump, fuel tank, fuel lines, fuel injection (implied mention of FI, though likely carbureted model)

Transmission Drivetrain:

Transmission, clutch, primary reduction gear, drive shaft, drive train, kickstart, starter, flywheel, gearshift

Suspension Steering:

Suspension, forks, triple tree, handlebars, steering, swingarm, struts

Braking System:

Brakes, brake pads, rotors, brake lever, hydraulic system (implied)

Electrical System:

Ignition system, lighting (lights), rectifier, regulator, battery, charging system, switches, electrical schematic

Bodywork Chassis:

Body, panels, plastic, fenders, seat, handle, bars, frame, tank

Wheels Tires:

Wheels, tires, tire size, wheel bolt pattern (implied)

Procedures Included

Maintenance:

Preventative maintenance, oil change, coolant change, fluid specifications, lubrication, filter replacement (implied)

Repair:

Repairing all components, engine rebuild, carburetor rebuild, suspension repair, brake repair, electrical system repair

Troubleshooting:

Troubleshooting problems, diagnosing issues, 'no spark' issues, error codes

Diagnostics:

Diagnosing problems, fault finding

Restoration:

Restoring the motorcycle

Installation:

Component installation

Adjustments:

Idle adjustment, mixture screw adjustment, valve clearance adjustment

Technical Depth

Technical Depth:

Comprehensive, detailed step-by-step instructions for repair, service, and maintenance

Illustration Quality:

Illustrated with clear step-by-step instructions, zoomable illustrations, exploded views, component breakdowns

Target Audience:

Professional technicians, mechanics, workshops, DIY individuals

Content Scope:

Complete step-by-step information for servicing, repairing, and preventative maintenance

📊 Manual Specifications

File Format

File Format:

File Size Consideration:

Can be very large (up to 5 GB)

File Type Examples:

.pdf, .zip, .rar, .exe

Print Quality

Print Restriction:

No restrictions on printing

Binding Type

Binding Type:

Not applicable (Digital Download)

Paper Type

Paper Type:

Not applicable (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Four-stroke, single-cylinder

Displacement:

99.7 cc (cubic centimeters)

Bore X Stroke:

52.0 mm x 45.0 mm (approximate, common for this engine family)

Cooling System:

Air-cooled

Compression Ratio:

Approximately 9.2:1 (typical for this era and displacement)

Engine Family:

Yamaha 100cc air-cooled 4-stroke

Performance

Horsepower:

Estimated 7-8 HP (at ~6500 RPM, typical for a 100cc engine of this type)

Torque:

Estimated 5-6 lb-ft (at ~5000 RPM, typical)

Fuel System

Carburetor Type:

Mikuni VM Series (e.g., VM17SH, common for Yamaha 100cc models)

Fuel Type:

Unleaded gasoline

Fuel Tank Capacity:

Approximately 2.5 Liters (typical for this size ATV)

🔧 Transmission

Standard

Transmission Type:

Automatic with torque converter (CVT-like operation)

Drive System:

Shaft drive (2WD)

Features

Reverse:

Gear Selection:

Forward, Neutral, Reverse

📐 Dimensions

Exterior

Length:

Approx. 1700 mm (66.9 inches)

Width:

Approx. 970 mm (38.2 inches)

Height:

Approx. 1000 mm (39.4 inches)

Weights

Dry Weight:

Approx. 110 kg (242 lbs)

Curb Weight:

Approx. 118 kg (260 lbs)

🛡️ Safety Features

Ratings

Safety Ratings:

Not applicable (ATVs of this era typically did not have standardized crash ratings)

Active Features

Active Safety Features:

Mechanical parking brake, front and rear drum brakes (standard)

Passive Features

Passive Safety Features:

Handlebar grips, footwells with heel guards, headlight, taillight

💡 Technology Features

Infotainment

Infotainment System:

Not applicable (basic mechanical ATV)

Driver Assistance

Driver Assistance Features:

Not applicable

Connectivity

Connectivity Features:

Not applicable

🔧 Maintenance

Service Intervals

Engine Oil Change:

Every 1000 km or 6 months (typical, refer to manual for exact)

Spark Plug Inspection:

Every 1000 km or annually (typical)

Air Filter Cleaning:

Every 500 km or as needed in dusty conditions (typical)

Fluid Specifications

Engine Oil Type:

Yamalube 4-stroke motorcycle oil SAE 10W-30 API SE or SF (or equivalent)

Engine Oil Capacity:

Approx. 1.0 Liter (with filter change)

Gear Oil Type:

Hypoid gear oil SAE 80 API GL-4 (for final drive/transmission)

Brake Fluid Type:

DOT 3 or DOT 4 (for hydraulic systems, if applicable)

Known Issues

Known Issues:

Carburetor clogging due to fuel varnish, electrical connector corrosion, starter motor wear, suspension seal leaks (common for vehicles of this age)

Common Troubleshooting Topic:

Starting problems ('no spark'), carburetor jetting, idle speed adjustments.

📚 Vehicle History

Brand Heritage

Brand Heritage:

Yamaha Motor Company, a long-standing manufacturer of motorcycles and powersports vehicles, known for reliability and innovation.

Model Evolution

Model Line Context:

Part of Yamaha's early 'Moto-4' line, designed as an accessible and practical ATV for recreational and utility use.

Production

Production Location:

Likely Japan or USA (common for Yamaha ATVs of this period)

🏆 Awards & Recognition

Recognitions

Recognitions:

Not applicable (specific awards for this model are unlikely to be documented publicly)