The TRI-Z 250, identified by model designations YTZ250 and YTZ250N, represents a pioneering high-performance sport All-Terrain Vehicle (ATV) from the mid-1980s. As a key player in the evolution of sport ATVs, the TRI-Z 250 is celebrated for its potent 236cc two-stroke liquid-cooled engine, a 6-speed manual transmission with a wet multi-plate clutch, and robust hydraulic disc brakes. Its engineering quality is evident in its durable steel frame and its reputation as a dominant machine in its class, directly competing with other performance ATVs of its era. This model offers an exciting and capable riding experience, making it a sought-after machine for enthusiasts and collectors alike. This comprehensive workshop service repair manual in English provides detailed, factory-authorized information for all TRI-Z 250 models. It covers essential areas including engine mechanics, drivetrain, chassis and suspension, and the electrical system, offering step-by-step procedures for maintenance, repair, and overhaul. The manual is designed for professional technicians and DIY mechanics, featuring detailed diagrams, critical specifications, and troubleshooting guidance to ensure optimal performance and longevity of the vehicle. With its professional-level depth and instructional clarity, this manual is an indispensable resource for anyone looking to maintain, diagnose, or repair their TRI-Z 250. 🏷️ Basic Information Identification Make: Yamaha Model: TRI-Z 250 Model Designation: YTZ250 / YTZ250N Vehicle Type: All-Terrain Vehicle (ATV) Generation Generation Identifier: First Generation Codes Model Codes: YTZ250, YTZ250N 👋 Introduction Market Position Target Audience: ATV Owners, DIY Mechanics, Professional Repair Shops Competitive Analysis Advantage: Factory-authorized information, same as used by local service/repair shops, comprehensive coverage, digital format convenience Key Features Content Source: Original Yamaha Workshop Manual, Wiring Diagrams, Bulletins Cost Savings: Enables users to save significant money on repair bills by performing repairs themselves Accessibility: Instant download allows immediate access to repair information 📋 Manual Details Coverage Areas Supported Models: All Models/Engines/Trim/Transmissions Types (specifically YTZ250 and YTZ250N) Page Count Estimated Page Count: Hundreds (specific number not provided, but described as comprehensive) Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: General Information, Fuel System, Cooling System, Top End, Lubrication System, Engine Removal/Installation, Crankshaft/Transmission Drivetrain: Clutch, Crankshaft/Transmission, Final Drive Chassis And Suspension: Wheels/Tires, Brakes, Suspension, Steering, Frame Electrical System: Electrical System, Wiring Diagrams Auxiliary Systems: Appendix Procedures Included Maintenance: Scheduled Maintenance, Routine Checks, Fluid Changes, Filter Replacements Repair And Overhaul: Disassembly, Assembly, Component Rebuilds, Engine Overhaul, Transmission Repair, Brake System Servicing, Suspension Adjustments Troubleshooting: Diagnostic Procedures, Common Issue Resolution, Electrical Troubleshooting Technical Depth Depth: Professional Technician Level (comprehensive diagnostic, repair, and maintenance information) Instructional Style: Step-by-step repair procedures, detailed diagrams, pictures, numbered instructions, critical specifications, notes, cautions, and warnings 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Full Printable Zoom Functionality: Zoom IN/OUT enabled Binding Type Binding: Digital Download (electronic format, printable sections) Paper Type Paper Type: Not Applicable (Digital) Delivery Delivery Method: Instant Download Requirements Software Requirements: Adobe PDF Reader, WinZip Compatibility Operating Systems: Compatible with All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: 2-Stroke, Reed Valve, Liquid-Cooled Displacement: 236cc (refer to specific model year for exact specifications) Bore X Stroke: 65.0 mm x 70.5 mm (typical for 236cc, confirm with manual) Performance Horsepower: Approx. 20-25 HP (estimated, varies by year and tuning, refer to manual for exact figures) Torque: Refer to specific manual for torque figures Fuel System Carburetor: Mikuni VM Series (e.g., VM34SS, verify in manual) Fuel Type: Unleaded Gasoline (refer to manual for octane rating recommendations) Oil Mixture: 2-Stroke Oil (premix, refer to manual for specific ratio) Cooling System Cooling Method: Liquid-Cooled Coolant Type: Ethylene Glycol-Based Antifreeze (refer to manual for specification and mixture ratio) 🔧 Transmission Standard Transmission Type: 6-Speed Manual with Clutch Clutch Type: Wet Multi-Plate Clutch Features Gear Ratios: Refer to manual for specific gear ratios for each speed Transmission Fluid Type: Yamaha Genuine Gear Oil or equivalent API GL-4 (refer to manual for specific viscosity and capacity) 📐 Dimensions Exterior Length: Refer to specific model year specifications in the manual Width: Refer to specific model year specifications in the manual Height: Refer to specific model year specifications in the manual Weights Dry Weight: Approx. 170 kg (375 lbs) (refer to specific model year for accuracy) Wheels Tires Front Tire Size: 21 x 7-10 (typical, verify in manual) Rear Tire Size: 20 x 11-9 (typical, verify in manual) Wheel Bolt Pattern: Refer to manual for hub specifications 🛡️ Safety Features Ratings Safety Standards: Designed to meet relevant ATV safety regulations of its era Active Features Braking System: Hydraulic Disc Brakes (Front and Rear) Passive Features Frame Construction: Durable Steel Frame 💡 Technology Features Infotainment Infotainment System: Not applicable for this performance-oriented sport ATV of its era. Driver Assistance Driver Assistance Features: None typically found on this model. Connectivity Connectivity Options: Not applicable for this model. 🔧 Maintenance Service Intervals...