🏷️ Basic Information

Make:

Yamaha

Model:

YFM350ER Moto-4

Generation:

First Generation

Engine Type:

Air-cooled, 4-stroke, SOHC, 2-valve

Chassis Code:

YFM350ER

👋 Introduction

Target Audience:

Owners and DIY mechanics of 1987-1990 Yamaha YFM350ER Moto-4 ATVs

Value Proposition:

Cost savings on repairs and maintenance, empowerment of owners to perform their own servicing

Advantage:

Specific coverage for YFM350ER, comprehensive detail, extensive diagrams, immediate digital delivery

Feature 1:

Covers all repairs A-Z, mechanical and electrical

Feature 2:

Tons of detailed pictures and diagrams

Feature 3:

Printable pages for on-demand access

Feature 4:

Instant download delivery

Feature 5:

Professional quality service manual

📋 Manual Details

Model Years Covered:

1987, 1988, 1989, 1990

All Models Included:

Yes

All Engine Types Included:

Yes (specific to YFM350ER engine)

Estimated Page Count:

Likely extensive, typical for comprehensive workshop manuals (specific count not provided but implied to be thorough)

Type:

Workshop Service Repair Manual

Language:

English

File Format:

PDF Download

📖 Manual Coverage

Engine:

Complete engine overhaul, disassembly, assembly, tuning, troubleshooting

Transmission:

Manual transmission service, clutch operation and repair

Drivetrain:

Driveshaft, differential, rear axle assembly

Suspension:

Front and rear suspension systems, shock absorbers, linkage

Steering:

Steering mechanism, tie rods, bearings

Brakes:

Front and rear brake systems, hydraulic lines, calipers, pads

Electrical:

Ignition system, lighting, battery, starter, charging system, wiring diagrams

Fuel System:

Carburetor service, fuel lines, fuel tank

Cooling System:

Air cooling system specifics

Bodywork:

Fenders, racks, body panels, seat

Routine Maintenance:

Oil changes, filter replacement, chain adjustments, lubrication

Tune Up:

Carburetor adjustments, ignition timing, valve clearance

Engine Rebuild:

Piston, rings, cylinder, crankshaft, bearings, seals

Transmission Repair:

Gearbox disassembly, inspection, reassembly

Electrical Diagnostics:

Troubleshooting starting, charging, and ignition issues using wiring diagrams

Suspension Overhaul:

Shock absorber replacement, bearing service, linkage lubrication

Brake System Service:

Bleeding brakes, pad replacement, caliper service

Carburetor Tuning:

Jetting, float level adjustments, cleaning

Valve Timing:

Chain and sprocket alignment, valve clearance adjustment

Depth:

Comprehensive A-Z coverage of mechanical and electrical repairs

Detail Level:

Detailed step-by-step instructions with numerous pictures and diagrams

Diagnostic Procedures:

Includes troubleshooting guides for common problems

Special Tools:

Mentions required special tools for specific procedures

📊 Manual Specifications

File Type:

PDF

Accessibility:

Downloadable, printable

Printability:

All pages are printable

Image Quality:

High-quality pictures and diagrams

Digital Binding:

N/A (Digital download)

Digital Paper Type:

N/A (Digital download)

⚙️ Engine Specifications

Engine Displacement:

348cc

Engine Configuration:

Single cylinder

Bore X Stroke:

78.0 mm x 72.0 mm

Cooling System:

Air-cooled

Compression Ratio:

9.2:1

Valve Train:

SOHC, 2 valves

Horsepower:

Approximately 20-25 HP (specific figures vary by source and exact tuning)

Torque:

Not explicitly provided, but expected to be robust for its class.

Carburetor Type:

Mikuni VM34SS (typical for this model)

Fuel Type:

Unleaded gasoline

Ignition System:

CDI (Capacitor Discharge Ignition)

Lubrication System:

Wet sump

🔧 Transmission

Type:

5-speed manual with reverse

Type:

N/A

Clutch Type:

Wet, multi-plate

Drive Type:

Shaft drive to rear axle

📐 Dimensions

Length:

Approx. 77.4 in (1965 mm)

Width:

Approx. 40.6 in (1030 mm)

Height:

Approx. 43.3 in (1100 mm)

Dry Weight:

Approx. 467 lbs (212 kg)

Ground Clearance:

Approx. 4.7 in (120 mm)

🛡️ Safety Features

Atv Safety Considerations:

Rollover risk, importance of protective gear (helmet, boots, gloves, etc.)

Braking System:

Front: Dual hydraulic disc; Rear: Single hydraulic disc

Lighting:

Headlight, taillight/brakelight

💡 Technology Features

Features:

N/A (Basic recreational ATV of its era)

Features:

N/A (No electronic driver aids typical of modern vehicles)

Features:

N/A

🔧 Maintenance

Engine Oil Change:

Recommended every 1,000 km or 3 months, or more frequently under severe use (refer to manual for precise intervals)

Air Filter Cleaning:

Regular inspection and cleaning/replacement, especially in dusty conditions

Spark Plug Inspection:

Inspect and adjust gap at specified intervals, replace as needed

Engine Oil Type:

Yamalube 4 (or equivalent SAE 10W-30 or 20W-40, API SE, SF, SG type lubricant, refer to manual for exact specification)

Engine Oil Capacity:

Approx. 1.6 L (1.7 US qt) without filter change, 1.8 L (1.9 US qt) with filter change (verify in manual)

Brake Fluid:

DOT 3 or DOT 4 hydraulic brake fluid (verify in manual)

Carburetor Clogging:

Common with older fuel, requires cleaning and proper storage procedures

Electrical Connections:

Corrosion or looseness can cause intermittent issues, especially with grounding points

Suspension Wear:

Bushings and bearings can wear over time, leading to play and reduced handling

Chain And Sprocket Wear:

Regular lubrication and adjustment are crucial for longevity

📚 Vehicle History

Yamaha Atv Legacy:

Yamaha has a long-standing history in powersports, including pioneering the ATV market with models like the Tri-Z and the original 'Moto-4' line.

Moto 4 Series:

The Moto-4 series was Yamaha's entry into the utility and recreational ATV market, emphasizing reliability and four-wheel drive capability on some variants, though the YFM350ER is a 2WD model. The ER designation typically indicates electric start for this model.

Manufacturing Era:

Late 1980s, a period of significant growth and innovation in the ATV industry.

🏆 Awards & Recognition

Atv Industry Impact:

The Moto-4 series was instrumental in establishing Yamaha's reputation for durable and capable ATVs, contributing to its market share in the late 80s and early 90s.

Reliability Reputation:

Generally considered a reliable workhorse for its time, with proper maintenance.

Manual Quality:

Professional quality service and repair manuals