🏷️ Basic Information Identification Make: Yamaha Model: YFM350ER Moto-4 Generation: First Generation Engine Type: Air-cooled, 4-stroke, SOHC, 2-valve Codes Chassis Code: YFM350ER 👋 Introduction Market Position 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 Competitive Analysis Advantage: Specific coverage for YFM350ER, comprehensive detail, extensive diagrams, immediate digital delivery Key Features 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 Coverage Areas Model Years Covered: 1987, 1988, 1989, 1990 All Models Included: Yes All Engine Types Included: Yes (specific to YFM350ER engine) Page Count Estimated Page Count: Likely extensive, typical for comprehensive workshop manuals (specific count not provided but implied to be thorough) Manual Type Type: Workshop Service Repair Manual Language Language: English Format File Format: PDF Download 📖 Manual Coverage Systems Covered 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 Procedures Included 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 Technical Depth 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 Format File Type: PDF Accessibility: Downloadable, printable Print Quality Printability: All pages are printable Image Quality: High-quality pictures and diagrams Binding Type Digital Binding: N/A (Digital download) Paper Type Digital Paper Type: N/A (Digital download) ⚙️ Engine Specifications Primary Engine 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 Performance 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. Fuel System Carburetor Type: Mikuni VM34SS (typical for this model) Fuel Type: Unleaded gasoline Ignition Ignition System: CDI (Capacitor Discharge Ignition) Lubrication Lubrication System: Wet sump 🔧 Transmission Standard Type: 5-speed manual with reverse Optional Type: N/A Features Clutch Type: Wet, multi-plate Drive Type: Shaft drive to rear axle 📐 Dimensions Exterior Length: Approx. 77.4 in (1965 mm) Width: Approx. 40.6 in (1030 mm) Height: Approx. 43.3 in (1100 mm) Weights Dry Weight: Approx. 467 lbs (212 kg) Ground Clearance: Approx. 4.7 in (120 mm) 🛡️ Safety Features Ratings Atv Safety Considerations: Rollover risk, importance of protective gear (helmet, boots, gloves, etc.) Active Features Braking System: Front: Dual hydraulic disc; Rear: Single hydraulic disc Passive Features Lighting: Headlight, taillight/brakelight 💡 Technology Features Infotainment Features: N/A (Basic recreational ATV of its era) Driver Assistance Features: N/A (No electronic driver aids typical of modern vehicles) Connectivity Features: N/A 🔧 Maintenance Service Intervals 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 Fluid Specifications 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) Known Issues 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 Brand Heritage 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....