1985-1986 Yamaha Tri-Z 250 Repair Manual

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Tipo: Atv

Proveedor:

SKU: 93754

Etiquetas: 1985 1986 ATV Powersports Tri Z Models Tri-Z 250 Yamaha

Variantes de producto

Descripción

The Tri-Z 250, produced from 1985 to 1986, stands as a legendary high-performance sport ATV, celebrated for its powerful 2-stroke, liquid-cooled, single-cylinder engine and advanced suspension systems. This model, known by its code YTZ250S, was the flagship in the sport ATV segment during its production years, offering enthusiasts a potent combination of agility, speed, and handling that made it a formidable competitor and a thrill to ride. Its engineering quality and reliability, characteristic of the powersports legacy, cemented its status as a significant machine in ATV history, earning accolades for its racing prowess and exhilarating performance. This comprehensive factory service manual provides detailed information essential for the maintenance, repair, and optimization of your Tri-Z 250. It covers all critical systems, including the engine, cooling, fuel, transmission, clutch, final drive, body, frame, steering, suspension, brakes, and electrical components, with specific attention to common issues and their solutions. The manual offers step-by-step repair instructions, disassembly and assembly procedures, diagnostic guidance, and precise technical specifications such as torque values and fluid requirements. Its scope is designed to empower owners and technicians alike, ensuring the longevity and peak performance of this iconic sport ATV through factory-accurate, illustrated instructions.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Tri-Z 250

Model Code:

YTZ250S

Year:

1985-1986

👋 Introduction

Market Position

Segment:

High-performance sport ATV

Target Audience:

Enthusiasts seeking to maintain, repair, and optimize their Yamaha Tri-Z 250

Competitive Analysis

Competitors:

Honda TRX series, Suzuki QuadRacer LT series, Kawasaki Bayou series

Key Features

Manual Benefit:

Empowers owners with the knowledge to perform all necessary service and repair, saving time and money on dealership visits.

Accessibility:

Instant download and permanent storage for continuous access across multiple devices.

Content Quality:

Factory-accurate information, including detailed diagrams and exploded views for precise component identification and assembly.

📋 Manual Details

Coverage Areas

Covered Models:

Tri-Z 250, YTZ250S

Covered Years:

1985, 1986

Page Count

Estimated Page Count:

Varies (typical factory service manuals for this era can range from 300-600 pages)

Manual Type

Type:

Factory Service Manual / Repair Manual

Language

Language:

English

Format

Format:

Digital Download (PDF)

📖 Manual Coverage

Systems Covered

Engine:

Complete engine overhaul, tuning, specifications, and troubleshooting

Cooling System:

Radiator, hoses, coolant specifications, pump operation

Fuel System:

Carburetor (Mikuni VM Series), fuel pump, fuel tank, fuel lines, jetting

Transmission:

Gearbox disassembly, inspection, repair, and specifications

Clutching:

Clutch operation, adjustment, disassembly, and components

Final Drive:

Chain and sprocket maintenance, inspection, and replacement

Body And Frame:

Frame inspection, body panel removal and installation, seating, plastics

Steering And Suspension:

Handlebar, steering stem, front forks (preload, compression, rebound damping), rear shock absorber, swingarm, linkage

Brakes:

Front and rear brake systems, hydraulic lines, master cylinders, calipers, pads, bleeding procedures

Electrical:

Ignition system, lighting, charging system (stator, rectifier), battery, switches, fuses

Wiring Diagrams:

Comprehensive electrical wiring schematics

Procedures Included

Maintenance:

Routine maintenance, lubrication, adjustments, pre-ride inspections

Troubleshooting:

Diagnostic procedures for common problems and system failures

Repair:

Step-by-step repair instructions for all major components and systems

Disassembly Assembly:

Detailed procedures for component removal and reinstallation

Specifications Data:

Torque values, clearances, fluid capacities, measurements

Technical Depth

Depth:

Comprehensive coverage suitable for both DIY enthusiasts and professional mechanics, covering everything from basic maintenance to full engine and transmission rebuilds.

📊 Manual Specifications

File Format

Format:

Searchability:

Searchable text for quick access to information

Print Quality

Quality:

Identical to original printed manuals, includes clear illustrations and diagrams

Binding Type

Type:

N/A (Digital - printable pages)

Paper Type

Type:

N/A (Digital - printable pages)

⚙️ Engine Specifications

Primary Engine

Type:

2-stroke, Liquid-Cooled, Reed Valve, Single Cylinder

Displacement:

236 cc (14.4 cubic inches)

Bore X Stroke:

66.0 mm x 68.0 mm (2.60 in x 2.68 in)

Compression Ratio:

6.7:1

Performance

Horsepower Estimated:

Approximately 27-30 hp (stock)

Torque Estimated:

Not explicitly stated, but strong mid-range power delivery

Fuel System

Carburetor Model:

Mikuni VM34SS

Fuel Type:

Unleaded gasoline (typically 91 octane or higher)

Fuel Mix:

Premix (typically 20:1 or 32:1 ratio of unleaded gasoline to 2-stroke oil, refer to manual for exact specification)

🔧 Transmission

Standard

Type:

Constant Mesh, 6-speed Sequential

Optional

Type:

Features

Clutch Type:

Wet, multiple disc

Transmission Oil Type:

Yamaha Genuine Gear Oil or equivalent SAE 80 API GL-4 (refer to manual for specific viscosity and capacity)

📐 Dimensions

Exterior

Length:

Approximately 73.4 inches (1865 mm)

Width:

Approximately 45.5 inches (1155 mm)

Height:

Approximately 43.5 inches (1105 mm)

Weights

Dry Weight:

Approximately 397 lbs (180 kg)

Fuel Tank Capacity:

2.4 US gal (9.0 L)

🛡️ Safety Features

Ratings

Crash Test Results:

N/A (ATV category, not subject to automotive crash testing standards)

Active Features

Braking System:

Dual front disc brakes, single rear disc brake

Passive Features

Handlebars:

Wide handlebars for control and leverage

💡 Technology Features

Infotainment

System:

N/A (Basic mechanical and electrical systems)

Driver Assistance

Features:

Connectivity

Features:

🔧 Maintenance

Service Intervals

Oil Change Transmission:

Every 10-20 hours of operation or annually (refer to manual for specific recommendation)

Spark Plug Check Replace:

Check every 5-10 hours, replace as needed (NGK BR9ES or equivalent)

Air Filter Cleaning:

Clean every 5-10 hours, especially in dusty conditions

Chain Lubrication Adjustment:

Lubricate every 5-10 hours, adjust chain slack as needed

Fluid Specifications

Engine Oil Type:

High-quality 2-stroke premix oil (API-TC or JASO FD rated)

Coolant Type:

Ethylene glycol based coolant (50/50 mix with distilled water)

Brake Fluid:

DOT 3 or DOT 4 hydraulic brake fluid

Known Issues

Carburetor Issues:

Clogged jets, float bowl issues, leading to poor performance or starting problems.

Suspension Wear:

Worn fork seals and bushings, rear shock absorber degradation due to age and usage.

Engine Seals:

Leaking crankcase seals can lead to air leaks and affect performance.

Electrical Connections:

Corroded or loose electrical connectors can cause intermittent issues.

📚 Vehicle History

Brand Heritage

Legacy:

Yamaha has a long and successful history in powersports, known for innovation and performance, particularly in 2-stroke technology.

Model Evolution

Tri Z Significance:

The Tri-Z was Yamaha's flagship sport ATV of its era, celebrated for its powerful 2-stroke engine, advanced suspension, and agile handling. It established Yamaha as a leader in the performance ATV market.

Production

Production Years:

1985-1988

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Performance Accolades:

Widely regarded as one of the most potent and capable sport ATVs of the 1980s, earning a reputation for racing dominance and exhilarating performance.