The 1985-1987 Yamaha Tri-Z 250 (YTZ250) represents a significant model in Yamaha's performance ATV lineage, building upon earlier designs with a potent two-stroke, liquid-cooled 236cc engine. This model is recognized for its sporty handling and powerful performance, making it a notable entry in the early performance ATV market. Its engineering quality and reliability, hallmarks of Yamaha's manufacturing, ensure a robust and capable machine for enthusiasts and riders. This comprehensive factory service repair manual, written in English, provides complete information for the maintenance, troubleshooting, and repair of the Yamaha Tri-Z 250. It covers all essential systems, including the engine, transmission, brakes, electrical system, and suspension, detailing procedures from general maintenance and lubrication to complex component replacement and diagnostics. The manual includes critical technical data, torque specifications, and detailed diagrams, making it an indispensable resource for technicians, mechanics, and owners dedicated to preserving the optimal performance and longevity of their Tri-Z 250. 🏷️ Basic Information Identification Make: Yamaha Model: Tri-Z 250 Model Code: YTZ250 Year: 1986 Generation Generation Name: First Generation Codes Engine Code: YTZ250 👋 Introduction Market Position Target Audience: Technicians, mechanics, and enthusiasts seeking to repair, learn, or work on the Yamaha Tri-Z 250. Competitive Analysis Value Proposition: Low price, great quality, instant access, comprehensive information for repair and learning. Key Features Manual Features: Official factory service repair manual, complete information, original manufacturer data, circuit diagrams, equipment datasheets, printable in high quality. 📋 Manual Details Coverage Areas Manual Coverage Overview: Comprehensive service and repair for the 1986 Yamaha Tri-Z 250 (YTZ250). Operating Manual Sections: Safety hints, specifications, control devices, operation, transportation, maintenance. Operating Manual Subsections: Before, during, and after operation safety; major component specs; cab and cluster controls; starting/stopping engine, working device operation, traveling; preparation for transport, loading/unloading; maintenance checks, tightening torques, fluid specifications. Page Count Estimated Page Count: Hundreds or thousands (printable at great quality). Manual Type Manual Type: Factory Service Repair Manual Language Language: English Format File Format: PDF Delivery Method: Instant Download Software Requirements: Adobe PDF Reader, WinZip (for larger files) 📖 Manual Coverage Systems Covered Covered Systems: General Maintenance, Troubleshooting, Engine Service/Repair, Transmission Service/Repair, Brake System, Wiring Diagram, Electrical System, Suspension, Periodic Lubrication, Steering, Cooling System, Fuel Injection, Fuel System, Emission System, Heater/Air Conditioner, Engine Control System, Chassis/Body, Restraint System, Interior, Differential/Drive, Axle. Electrical System Details: Detailed wiring diagrams, troubleshooting electrical faults, component testing (ignition, lighting, starting system). Engine Repair Details: Engine disassembly, cylinder head service, piston and connecting rod inspection/replacement, crankshaft service, valve adjustments (if applicable), timing checks. Fuel System Details: Carburetor overhaul, cleaning, adjustment, fuel line inspection, fuel tank service. Procedures Included Included Procedures: Repair, maintenance, troubleshooting, diagnostics, disassembly, assembly, adjustments, component replacement, electrical system repair, fuel system service, lubrication, suspension tuning, brake service, cooling system maintenance. Troubleshooting Procedures: Systematic diagnostic charts and steps for identifying and resolving common operational problems. Periodic Maintenance: Detailed instructions for regular checks and servicing to maintain optimal performance and longevity. Technical Depth Depth Of Information: Complete factory information, technical data, circuits, diagrams, equipment specifications. Torque Specifications: Includes critical torque values for various fasteners and components to ensure proper assembly. Diagrams And Schematics: Contains essential diagrams for electrical systems, chassis components, and engine internals. Suspension Details Suspension Service: Front and rear suspension inspection, shock absorber service, spring adjustments, fork seal replacement. Brake System Details Brake Service: Front and rear brake caliper service, master cylinder overhaul, brake pad replacement, brake fluid bleeding, rotor inspection. 📊 Manual Specifications File Format Print Quality: High Quality (printable) Searchability: Likely searchable PDF content, depending on original formatting. Binding Type Binding Type Digital: N/A (Digital Download) Paper Type Paper Type Digital: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, Liquid-Cooled, Reed Valve Displacement: 236cc Bore X Stroke: 68.0 x 64.0 mm Compression Ratio: 7.2:1 Performance Horsepower: Approximately 22.6 HP (This may vary, consult manual for exact spec) Torque: Consult manual for exact torque specifications. Fuel System Carburetor: Mikuni VM34SS (typical) Fuel Type: Unleaded gasoline (consult manual for octane rating) Fuel Injection: Not applicable (Carbureted) Cooling System Cooling Method: Liquid-cooled Coolant Type: Permanent antifreeze (consult manual for specific mixture and type) Lubrication Oil Type: Two-stroke engine oil (consult manual for specific grade and mix ratio) 🔧 Transmission Standard Transmission Type: 6-speed manual Clutch Type: Wet, multi-disc Final Drive: Chain Features Gear Ratios: Consult manual for detailed gear ratios. 📐 Dimensions Exterior Overall Length: Consult manual for exact dimensions. Overall Width: Consult manual for exact dimensions. Overall Height: Consult manual for exact dimensions. Weights Dry Weight: Approximately 270 lbs (122.5 kg) (Consult manual for exact specification). Wet Weight: Consult manual for exact specification. 🛡️ Safety Features Ratings Safety Ratings: Not applicable (ATV, not subject to automotive safety ratings). Active Features Active Safety Features: Disc brakes front and rear, reliable chassis design. Passive Features Passive Safety Features: Handlebar design for control, rider ergonomics for stability....