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Yamaha

Yamaha Moto-4 350 Service Manual Repair 1987-1989 YFM350

Yamaha Moto-4 350 Service Manual Repair 1987-1989 YFM350

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Vehicle data plateRef 30587
Brand
Yamaha
Vehicle
ATV
Models covered
Moto 4 Models, Moto-4 350, YFM350
Years
1987, 1988, 1989
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

What happens after you pay

  • Download link opens on the order page immediately
  • The same link is emailed to you — re-download any time
  • Open on phone, tablet or PC; print only the pages you need
  • Not sure it covers your model year? Ask us before you buy
🏷️ Basic Information
Identification
Make:
Yamaha
Model:
Moto-4 350
Model Code:
YFM350
Vehicle Type:
All-Terrain Vehicle (ATV)
Codes
Product Name:
Yamaha Moto-4 350 Service Manual Repair 1987-1989 YFM350 PDF Download
👋 Introduction
Market Position
Market Position:
The Yamaha Moto-4 350 was a popular utility and recreational ATV in its era, known for its robust performance and reliability. This manual serves as an essential resource for owners and mechanics to maintain and repair these classic machines.
Competitive Analysis
Competitive Analysis:
Competed against models from Honda (e.g., TRX series), Suzuki (e.g., QuadSport series), and Kawasaki (e.g., Bayou series). The Moto-4 350 offered a strong balance of power and versatility.
Key Features
Key Features:
Comprehensive coverage of all major mechanical and electrical systems, detailed illustrations and diagrams, extensive troubleshooting section, and precise technical specifications make this manual an indispensable tool for preserving the functionality and longevity of the Yamaha Moto-4 350.
📋 Manual Details
Coverage Areas
Covered Years:
1987, 1988, 1989
Model Variant Coverage:
Moto-4 350 (YFM350)
Page Count
Page Count:
294
Manual Type
Manual Type:
Factory Repair Manual / Service Manual
Language
Language:
English
Format
Format:
PDF Download
📖 Manual Coverage
Systems Covered
Engine Systems:
Complete engine tear down and rebuild, lubrication, cooling system, fuel system (carburetor, fuel pump), ignition system, starting system (electric start, kickstart), exhaust system.
Drivetrain Systems:
Transmission, clutch, drive shaft, primary reduction gear, reverse gear, gearshift mechanism.
Chassis Systems:
Frame, suspension (front forks, rear suspension, swingarm), steering system (handlebar, triple tree), wheels, tires, brakes (front and rear, hydraulic, rotors, pads), bodywork, plastics, fenders.
Electrical Systems:
Battery, charging system (stator, rectifier, regulator), ignition coil, lights, switches, starter motor.
Procedures Included
Maintenance Procedures:
Scheduled maintenance, oil changes, filter replacement, spark plug inspection/replacement, air filter cleaning/replacement, valve clearance adjustment, brake system maintenance, chain adjustment, lubrication points.
Repair Procedures:
Complete engine overhaul, carburetor rebuild, transmission repair, suspension component replacement, brake caliper service, electrical component diagnosis and repair, body panel repair/replacement.
Troubleshooting:
Comprehensive troubleshooting guides for common issues such as starting problems, no spark, poor engine performance, carburetor issues, transmission shifting problems, electrical faults.
Installation Procedures:
Installation of various components and accessories (where applicable).
Technical Depth
Technical Depth:
Full factory-level detail, suitable for DIY enthusiasts and professional mechanics. Includes complete tear-down and rebuild instructions, detailed diagrams, torque specifications, and diagnostic procedures.
📊 Manual Specifications
File Format
File Format:
PDF (Portable Document Format)
Print Quality
Print Quality:
High-resolution scans, suitable for printing. No restrictions on printing.
Binding Type
Binding Type:
N/A (Digital Download)
Paper Type
Paper Type:
N/A (Digital Format)
Usability
Searchability:
Searchable text for quick information retrieval.
Navigation:
Clickable chapters for easy navigation.
Support
Replacement Policy:
Free replacement offered by the seller if the manual is lost.
⚙️ Engine Specifications
Primary Engine
Engine Type:
4-stroke, SOHC, air-cooled, single-cylinder
Displacement:
348 cc (21.2 cubic inches)
Bore X Stroke:
83.0 mm x 64.5 mm (approximate, varies by specific sub-model)
Compression Ratio:
8.5:1 (typical)
Performance
Horsepower:
Approximately 20-25 HP (estimated, not explicitly stated in product info)
Torque:
Not specified in product info, but torque specs are included within the manual.
Fuel System
Carburetor:
Single Mikuni carburetor (specific model usually Mikuni BS34 or similar), fuel pump.
Fuel Type:
Unleaded gasoline
Ignition
Ignition System:
CDI (Capacitor Discharge Ignition)
Lubrication
Oil Type:
Yamaha recommends Yamalube or a comparable high-quality SAE 10W-30 API SG or higher motorcycle oil. The manual will specify exact viscosity and API classification.
Oil Capacity:
Refer to manual for exact capacity, typically around 1.5 - 2.0 liters.
🔧 Transmission
Standard
Transmission Type:
5-speed manual with reverse
Clutch Type:
Wet, multi-plate
Drive System:
Shaft drive to rear axle, often with a differential lock or limited-slip functionality on some variants.
Features
Gear Ratios:
Specific gear ratios will be detailed in the manual.
📐 Dimensions
Exterior
Overall Length:
Refer to manual for precise dimensions, typically around 1900-2000 mm.
Overall Width:
Refer to manual for precise dimensions, typically around 1000-1100 mm.
Overall Height:
Refer to manual for precise dimensions, typically around 1100-1200 mm.
Weights
Dry Weight:
Approximately 200-220 kg (440-485 lbs), varies by specific model year and configuration.
Fuel Tank Capacity:
Refer to manual, typically around 9-12 liters.
🛡️ Safety Features
Ratings
Safety Ratings:
ATVs are not subject to traditional automotive safety ratings (e.g., NHTSA crash tests). User caution and adherence to operating guidelines in the manual are paramount.
Active Features
Active Safety Features:
Brake system (front and rear), thumb throttle with safety lever, kill switch.
Passive Features
Passive Safety Features:
Handlebars, footpegs, frame structure designed for stability.
💡 Technology Features
Infotainment
Infotainment System:
N/A (Basic utility ATV with no advanced infotainment features)
Driver Assistance
Driver Assistance Features:
N/A (No electronic driver assistance systems)
Connectivity
Connectivity Options:
N/A
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 1000 km or 6 months, but the manual will provide precise intervals based on operating conditions.
Air Filter Maintenance:
Recommended cleaning at 1000 km or more frequently in dusty conditions.
Valve Clearance Check:
Recommended inspection at 5000 km or as specified in the manual for optimal performance.
Fluid Specifications
Engine Oil Specification:
SAE 10W-30 API SG or higher motorcycle oil. Specific viscosity may vary with ambient temperature as detailed in the manual.
Brake Fluid Specification:
DOT 3 or DOT 4 hydraulic brake fluid (check manual for exact specification).
Coolant Specification:
Not applicable for this air-cooled engine.
Known Issues
Common Issues:
Carburetor gumming due to fuel sitting, starting issues (especially if electric starter is weak), rear brake performance degradation, wear on suspension components, and potential electrical gremlins over time.
Troubleshooting Areas:
The manual specifically addresses 'no spark' and carburetor-related problems, indicating these are common areas of concern for this model.
📚 Vehicle History
Brand Heritage
Brand Heritage:
Yamaha Motor Company, established in 1955, has a long history of producing high-quality motorcycles, ATVs, and marine products, known for innovation and performance.
Model Evolution
Model Evolution:
The Moto-4 350 was part of Yamaha's early entry into the ATV market, evolving from earlier smaller displacement models. It provided a significant step up in power and capability for recreational and utility users.
Production
Production Period:
The Moto-4 350 model was produced from the mid-1980s into the early 1990s, with this manual specifically covering the 1987-1989 model years.
🏆 Awards & Recognition
Recognitions
Recognitions:
Specific awards for this particular model year are not readily available, but Yamaha ATVs have consistently been recognized for their reliability and performance in the powersports industry.

Delivery & file format

This is a digital PDF download, not a printed book. After payment the download link appears on your order confirmation page and is emailed to the address you entered. Files open in any PDF reader on phone, tablet or computer and can be printed.

Check the model year and engine before you buy

Manufacturers change procedures, wiring and part numbers between model years and engine options. If your VIN plate shows a year or engine code that is not listed on the data plate above, contact us with the model, year and VIN and we will confirm coverage before you order.

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