🏷️ Basic Information Identification Make: Yamaha Model: TRI-Z 250 Model Code: 2RF Model Year: 1985-1986 Vehicle Type: All-Terrain Vehicle (ATV) Codes Manual Product Name: 1985 - 1986 Yamaha TRI-Z 250 Service Repair Manual 85 86 PDF Download 👋 Introduction Market Position Market Segment: Performance-oriented sport ATV of its era. Competitive Analysis Competitors Era: Competed with other high-performance sport ATVs from brands like Honda (e.g., TRX250R) and Suzuki. Key Features Key Features Vehicle: High-revving 2-stroke engine, advanced suspension for its time, sport-focused ergonomics. Manual Value Proposition Manual Value: Essential resource for owners and technicians, providing factory-level diagnostic and repair information, mirroring what dealers use. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive service and repair information for Yamaha TRI-Z 250 models from 1985 to 1986. Page Count Page Count: 244+ Manual Type Manual Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine System: Complete engine overhaul, diagnosis, repair, and tuning for the 246cc two-stroke engine. Carburetion System: Detailed carburetor adjustment, cleaning, rebuilding, and jetting information. Chassis System: Suspension, steering, frame, swingarm, and wheel bearing service and adjustments. Electrical System: Ignition system, lighting, battery, starter, and component testing and troubleshooting. Cooling System: Air cooling system checks and maintenance. Exhaust System: Pipe and silencer inspection and maintenance. Drive System: Chain, sprockets, and clutch inspection and service. Braking System: Front and rear brake caliper, master cylinder, and hydraulic system maintenance. Fuel System: Fuel tank, petcock, and fuel line service. Procedures Included Maintenance Procedures: Scheduled maintenance, lubrication, filter changes, and general upkeep. Repair Procedures: Step-by-step instructions for engine rebuilds, transmission repairs, and component replacements. Troubleshooting Procedures: Diagnostic flowcharts and symptom-based troubleshooting guides for common problems. Wiring Diagrams: Detailed electrical wiring schematics for fault diagnosis and repair. Technical Depth Depth Of Information: Provides in-depth technical information suitable for dealership technicians and experienced DIY mechanics. Rebuild Guidance: Includes comprehensive guidance for complete engine and transmission rebuilds. Diagnostic Capabilities: Offers advanced diagnostic procedures for electrical and mechanical issues. 📊 Manual Specifications File Format File Format: PDF (Portable Document Format) Searchability: Searchable text for quick information retrieval. Print Quality Print Quality Recommendation: Optimized for digital viewing; high-resolution scans ensure clarity for printing. Binding Type Binding Type: Not Applicable (Digital Download) Paper Type Paper Type: Not Applicable (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, reed valve, single-cylinder Displacement: 239cc (or 246cc for some model years/variants) Bore X Stroke: 68.0 mm x 64.0 mm Compression Ratio: 7.1:1 Cooling System: Air-cooled Ignition: CDI (Capacitor Discharge Ignition) Performance Horsepower: Approximately 30-35 HP (estimated, varies by year and tuning) Torque: Not explicitly stated in basic specs, but characteristic of its class. Fuel System Fuel Type: Unleaded gasoline mixed with 2-stroke oil (premix or oil injection system) Carburetor Model: Mikuni VM34SS (likely, specific to model year variations) 🔧 Transmission Standard Transmission Type: 6-speed constant mesh, manual clutch Optional Optional Gearbox: None Features Clutch Type: Wet, multi-plate Drive Type: Chain drive to rear wheels 📐 Dimensions Exterior Overall Length: Approx. 70.3 inches (1785 mm) Overall Width: Approx. 44.3 inches (1125 mm) Overall Height: Approx. 42.7 inches (1085 mm) Weights Dry Weight: Approx. 346 lbs (157 kg) Fuel Capacity: Approx. 2.4 gallons (9.0 L) Oil Capacity Transmission: Refer to manual for specific quantities (typically GL-4 or GL-5 gear oil). 🛡️ Safety Features Ratings Safety Certifications: As per applicable regulations for off-road vehicles of the era. Active Features Active Safety Features: None specific, relies on rider skill and ATV handling characteristics. Passive Features Passive Safety Features: Handlebar padding, footpegs with grip. 💡 Technology Features Infotainment Infotainment System: None (basic, performance-focused ATV) Driver Assistance Driver Assistance Features: None Connectivity Connectivity Options: None 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific recommendations based on usage (e.g., every 30-40 hours or annually). Spark Plug Replacement: Refer to manual (e.g., annually or every 100-200 hours). Air Filter Cleaning: Frequent cleaning recommended, especially in dusty conditions. Chain Lubrication Adjustment: Regularly, as needed, based on usage and environment. Fluid Specifications Transmission Fluid Type: Yamaha recommends specific gear oil (e.g., Yamalube Gear Oil) or equivalent GL-4/GL-5 rated gear oil. Consult manual for exact specification and capacity. 2 Stroke Oil Type: High-quality 2-stroke oil, specifically formulated for air-cooled, high-performance engines. JASO FD or higher is generally recommended. Consult manual for specific ratio if premixing. Brake Fluid Type: DOT 3 or DOT 4 brake fluid (ensure consistency). Known Issues Common Issues: Carburetor clogging, reed valve wear, suspension seal leaks, CDI unit failures, and general wear and tear on high-performance components. Maintenance Priority: Proper carb cleaning and jetting, regular chain maintenance, and checking for air leaks in the intake tract are crucial for optimal performance. 📚 Vehicle History Brand Heritage Yamaha Atv Heritage: Yamaha has a long history of producing innovative and performance-oriented ATVs, starting with the revolutionary 1980 YFM125...