The YTZ250N TRI-Z 250, produced between 1985 and 1988, stands as a highly regarded performance 3-wheel ATV. Known for its groundbreaking capabilities and aggressive off-road riding design, the TRI-Z 250 was a significant model in the mid-1980s ATV market. This model features a 2-stroke, 2-cylinder, liquid-cooled engine with a displacement of 236 cc, dual Mikuni carburetors, and a 6-speed transmission. Its engineering quality is reflected in its agile handling and powerful performance, making it a sought-after machine for enthusiasts. The legacy in powersports further solidifies the TRI-Z 250's reputation for innovation and reliability. This comprehensive service manual provides full coverage for all aspects of the YTZ250N TRI-Z 250, including detailed workshop procedures, repair instructions, maintenance schedules, and troubleshooting guidance. It covers all major systems, such as the engine, transmission, chassis, brakes, and electrical components, with hundreds of detailed photos and diagrams. The manual is designed to assist owners, mechanics, and technicians in effectively maintaining, diagnosing, and repairing the vehicle, ensuring optimal performance and longevity. Its professional-level detail makes it an indispensable resource for anyone working on this iconic 3-wheeler. 🏷️ Basic Information Identification Make: Yamaha Model: YTZ250N TRI-Z 250 Model Designation: TRI-Z 250 Production Years Covered: 1985-1988 Codes Model Code Prefix: YTZ250 👋 Introduction Market Position Segment: High-performance 3-wheel ATV (ATV/3-Wheeler) Target Audience: Enthusiasts, owners, and professional mechanics looking for comprehensive service and repair information Competitive Analysis Key Selling Points: Factory-level accuracy, detailed diagrams, lifetime access, full coverage of all systems, instant download convenience Key Features Manual Value Proposition: Provides all necessary information to maintain, repair, and troubleshoot the Yamaha YTZ250N TRI-Z 250 effectively and efficiently. 📋 Manual Details Coverage Areas Primary Coverage: Full Service, Repair, and Workshop Procedures Secondary Coverage: Troubleshooting, Diagnostics, Maintenance, Adjustments, Reassembly Page Count Estimated Page Count: Hundreds of Pages (specific count not provided, indicative of comprehensive coverage) Manual Type Type: Factory Service Manual / Workshop Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete engine disassembly, assembly, tuning, lubrication, cooling, fuel, ignition, exhaust systems Transmission: Clutch operation, gearbox maintenance, inspection, repair, lubrication Chassis: Frame inspection, suspension (front and rear), steering system, wheels, hubs, bearings Brakes: Front and rear brake system maintenance, adjustment, overhaul, fluid specifications Electrical: Ignition system, lighting, charging system, wiring diagrams, component testing Bodywork And Trim: Body panel removal and installation, seat, fenders, handlebars, controls Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, chain adjustment, lubrication points Troubleshooting: Diagnostic flowcharts, common problems and their solutions, symptom-based diagnosis Repair: Step-by-step repair instructions for all major components and systems Overhaul: Detailed instructions for complete engine, transmission, and suspension overhauls Adjustments: Carburetor tuning, clutch adjustment, brake lever adjustment, throttle cable adjustment Technical Depth Depth: Professional-level detail, suitable for mechanics and experienced enthusiasts; covers from basic maintenance to complete engine rebuilds Visuals: Hundreds of detailed photos and diagrams, including exploded views for component identification and assembly 📊 Manual Specifications File Format Type: PDF Compatibility: Windows and macOS compatible Print Quality Printability: Printable (single pages or entire manual) Binding Type Format Type: Digital Download (no physical binding) Paper Type Digital Format: N/A (Digital PDF) Licensing Usage License: Lifetime use on multiple devices/computers, no expiry, no renewal fees ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, 2-cylinder, Reed Valve, Liquid-Cooled Displacement: 236 cc (14.4 cu. in.) Bore X Stroke: 57.0 mm x 47.0 mm (2.24 in x 1.85 in) Compression Ratio: 6.5:1 (nominal) Carburetion: Dual Mikuni VM26SS, Butterfly Valve Performance Horsepower Estimate: Approx. 30-35 HP (Varies by year and specific tuning, exact factory figure often not published for this era of ATVs) Torque Estimate: Estimated torque figures not readily available but significant for its class Fuel System Fuel Type: Unleaded gasoline (91 octane or higher recommended) Fuel Mixture: Pre-mix oil/gasoline ratio specified in manual (typically 20:1 or 32:1 depending on oil type and application) Fuel Tank Capacity: 3.7 L (0.98 US gal) (Check specific year) Lubrication Cooling System: Liquid Cooling with Fan Crankcase Oil Capacity: N/A (2-stroke pre-mix lubrication) 🔧 Transmission Standard Type: 6-speed Constant Mesh, Foot Shift Features Clutch: Wet, Multi-plate Final Drive: O-ring sealed chain 📐 Dimensions Exterior Overall Length: Approx. 1,745 mm (68.7 in) (Check specific year) Overall Width: Approx. 1,090 mm (42.9 in) (Check specific year) Overall Height: Approx. 1,025 mm (40.4 in) (Check specific year) Weights Dry Weight: Approx. 150 kg (331 lbs) (Check specific year) Weight Distribution: N/A (Focus on overall handling and stability for 3-wheelers) 🛡️ Safety Features Ratings Crash Test Ratings: N/A (ATVs typically do not have standardized crash ratings like passenger cars) Active Features Braking System: Hydraulic Disc Brakes (Front and Rear) Suspension Design: Yamaha Power-Assisted Suspension (YPAS) for improved handling and stability Passive Features Handling Characteristics: Designed for aggressive off-road riding, known for agile handling and high performance 💡 Technology Features Infotainment System: N/A (Designed for off-road performance, no...