🏷️ Basic Information Identification Make: Yamaha Model: YTM225DRN Tri-Moto Model Nickname: Tri-Moto Production Years Covered: 1983, 1984, 1985, 1986 👋 Introduction Market Position Market Position: Specialty off-road vehicle (three-wheeler) aimed at recreational users and utility purposes. The YTM225DRN was a significant model in Yamaha's ATVs and trikes lineup during its production era. Competitive Analysis Competitive Analysis: Competed with other three-wheelers and early four-wheel ATVs from manufacturers like Honda, Kawasaki, and Suzuki. Known for its reliable engine and robust build, typical of Yamaha products. Key Features Key Features Manual: • Authoritative repair information • Detailed procedures for complex tasks • Incorporates proprietary component manufacturer instructions • Enables informed decision-making for repairs • Focus on quality service and reputation building Manual Value Proposition: Enables DIY maintenance and repair, saving costs associated with professional labor. Provides the knowledge base to perform repairs like a professional technician, enhancing owner understanding and vehicle longevity. 📋 Manual Details Coverage Areas Coverage Years: 1983-1986 Specific Model Variant Coverage: YTM225DRN (This specific model designation indicates a particular configuration of the YTM225 series, likely with some specific features or options.) Page Count Page Count: 282 Manual Type Manual Type: Workshop Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Systems Covered List: • Engine • Transmission • Fuel System • Ignition System • Lubrication System • Exhaust System • Electrical System • Bodywork • Chassis • Suspension • Brakes Engine Specifics: Engine assembly, disassembly, tuning, diagnostics, lubrication system details, cooling system operation (air-cooled). Fuel System Specifics: Carburetor (Mikuni VM series) overhaul, adjustment, cleaning, fuel tank, fuel lines, and petcock. Ignition System Specifics: CDI system components, spark plug specifications, timing adjustments (if applicable). Electrical System Specifics: Wiring diagrams, lighting system, charging system (stator, rectifier/regulator), battery maintenance, starter motor, fuses. Body Specifics: Body panel removal and installation, fenders, seat, handlebars, controls. Procedures Included Procedures Included List: • Tune-ups • Routine Maintenance • Removal and Installation • Assembly and Disassembly • Overhaul • Troubleshooting • Diagnostics • Repair Procedures • Component Inspection • Adjustment Procedures Engine Rebuild Procedures: Complete engine disassembly, piston replacement, cylinder honing, valve adjustments, crankcase assembly, and more. Transmission Rebuild Procedures: Gearbox disassembly, clutch inspection and replacement, shift mechanism repair, final drive unit service. Troubleshooting Guides: Systematic approaches to diagnosing common and uncommon problems, including symptoms and potential causes. Technical Depth Technical Depth: Comprehensive; covers general practices and product-specific details, including engine and transmission disassembly/rebuild. Assumes basic automotive knowledge. Special Tools: References to specific Yamaha special tools (with part numbers where applicable) required for certain adjustments or repairs. Torque Specifications: Detailed torque values for critical fasteners throughout the vehicle, essential for safe and correct assembly. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: Printable Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, Four-stroke, SOHC Engine Displacement: 223cc (13.6 cu. in.) Bore X Stroke: 66.0 mm x 65.0 mm (2.60 in x 2.56 in) Compression Ratio: 8.6:1 Performance Horsepower: Approx. 15-18 HP (Estimate based on similar era Yamaha engines) Torque: Torque figures not explicitly stated but indicative of robust low-to-mid range power for off-road use. Fuel System Carburetor Type: Mikuni VM Series (Specific model typically a VM32) Fuel Type: Unleaded Gasoline Fuel Tank Capacity: Approx. 2.4 US gal (9.1 L) Lubrication System Oil Type Recommendation: Yamalube 4 (or equivalent API SE, SF, SG or higher oil, SAE 20W-40 or 10W-30) Ignition System Ignition Type: CDI (Capacitor Discharge Ignition) 🔧 Transmission Standard Transmission Type: 5-speed Manual with Automatic Clutch Features Clutch Type: Wet, multiple-disc Drive Type: Shaft Drive Final Drive: Sealed O-ring chain Reverse Gear: Yes (typically via a separate shift lever) Fluid Specifications Transmission Oil Type: Yamalube Gear Oil (or equivalent SAE 80 hypoid gear oil) 📐 Dimensions Exterior Overall Length: Approx. 77.6 inches (1970 mm) Overall Width: Approx. 43.7 inches (1110 mm) Overall Height: Approx. 41.7 inches (1060 mm) Weights Dry Weight: Approx. 386 lbs (175 kg) Curb Weight: Approx. 408 lbs (185 kg) with fluids Suspension Front Suspension Type: Independent double wishbone with adjustable shocks Rear Suspension Type: Swing arm with adjustable shock absorber Tires Front Tire Size: AT21 x 7-10 Rear Tire Size: AT22 x 10-9 Brakes Front Brake Type: Dual hydraulic disc Rear Brake Type: Dual hydraulic disc 💡 Technology Features Infotainment Infotainment Features: N/A (Basic off-road vehicle design). Driver Assistance Driver Assistance Features: N/A (Basic off-road vehicle design). Connectivity Connectivity Features: N/A (Basic off-road vehicle design). 🔧 Maintenance Service Intervals Initial Service: First service typically at 100 miles or 1 month, followed by regular intervals (e.g., every 600 miles or 6 months for engine oil). Engine Oil Change Interval: Every 600 miles or 6 months (refer to manual for specific conditions). Air Filter Cleaning Interval: Frequently, especially in dusty...