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Yamaha Tri-Z 250 YTZ250 1986 Service Repair Manual

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The Tri-Z 250, model YTZ250, is a high-performance sport All-Terrain Vehicle (ATV) from 1986, renowned for its agility and racing capability. Designed with a focus on performance and engineered to...
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Typ: Atv
Anbieter:
Yamaha
Art.-Nr: 92228
Stichworte: 1986 ATV Powersports Tri Z Models Tri-Z 250 Yamaha YTZ250
Yamaha Tri-Z 250 YTZ250 1986 Service Repair Manual
The Tri-Z 250, model YTZ250, is a high-performance sport All-Terrain Vehicle (ATV) from 1986, renowned for its agility and racing capability. Designed with a focus on performance and engineered to compete with leading models of its era, the Tri-Z 250 features a liquid-cooled, 2-stroke, single-cylinder 236cc engine. Its robust steel frame and hydraulic disc brakes front and rear contribute to its durable construction and reliable handling, making it a sought-after machine for enthusiasts and those undertaking restoration projects. This comprehensive Service Repair Manual provides in-depth guidance for the repair, service, maintenance, and restoration of your Tri-Z 250 YTZ250 1986 ATV. Covering all essential systems, including the engine, transmission, drivetrain, chassis, suspension, and electrical components, this manual offers detailed procedures for everything from routine maintenance and fluid changes to complete engine and component overhauls. With clear, illustrated instructions and advanced diagnostic information, it serves as an invaluable resource for both professional technicians and DIY mechanics aiming to keep their Tri-Z 250 in peak operating condition.
🏷️ Basic Information
Identification
Make:
Yamaha
Model:
Tri-Z 250
Model Code:
YTZ250
Year:
1986
Vehicle Type:
All-Terrain Vehicle (ATV)
Codes
Internal Product Code:
YTZ250-1986-SRM-DL
👋 Introduction
Market Position
Segment:
High-performance sport ATV
Target Audience:
Enthusiasts, DIY mechanics, restoration projects
Competitive Analysis
Competitors 80S:
Honda TRX250R, Suzuki LT250R, Kawasaki Tecate-4
Key Features Vehicle
Design Philosophy:
Focus on performance, agility, and racing capability
Key Features Manual
Manual Value Proposition:
Empowers owners and technicians with the knowledge to maintain, repair, and restore the vehicle to peak condition.
Manual Value Proposition
Professional Vs Diy:
Equivalent to factory workshop manuals used by professional technicians, making it ideal for DIY enthusiasts.
📋 Manual Details
Coverage Areas
Primary Coverage:
Repair, Service, Maintenance, Restoration, Diagnosis, Troubleshooting
Page Count
Total Pages:
146
Manual Type
Type:
Service Repair Manual
Manual Purpose:
To provide comprehensive guidance for servicing, repairing, and maintaining the Yamaha Tri-Z 250 YTZ250 1986 ATV.
Language
Language:
English
Format
Delivery Format:
Digital Download (PDF, ZIP, RAR, EXE)
Searchable Text:
Likely contains searchable text, enhancing usability for quick information retrieval.
📖 Manual Coverage
Systems Covered
Engine:
Engine overhaul, piston, cylinder, connecting rod, crankshaft, bore, stroke, valve clearance, spark plug, compression ratio, engine oil, lubrication, mixture screw, fuel pump, fuel system, carburetor (rebuild, jetting, slow jet, main jet, pilot jet, carboretor), intake, exhaust, muffler, ignition system, magneto, starter, flywheel, electronic systems
Transmission Drivetrain:
Transmission, primary reduction gear, clutch (operation, adjustment), kickstart mechanism, drive shaft, drive train, swinger, swingarm, rear axle, rotors, wheel, tire, bogey, track, propulsion system
Chassis Suspension Brakes:
Frame, forks, struts, suspension (front and rear), linkage, steering, handlebars, triple trees, brakes (front and rear, rotors, pads), ski
Electrical:
Battery, charging system, rectifier, stator, coil, switches, lights, electronic diagnostics, schematics, diagrams
Bodywork Plastics:
Panels, fenders, body, seat, plastics, tank
Specific Components Mention:
Covers detailed information on components like the magneto, flywheel, fuel pump, spark plug, throttle cable, linkage, chain, gears, cam, radiator, and more.
Procedures Included
Routine Maintenance:
Scheduled maintenance, oil changes, fluid checks, filter replacement, lubrication schedule, air filter cleaning/replacement, spark plug replacement, brake system inspection, chain adjustment
Repair Rebuild:
Engine rebuild (top-end and bottom-end), carburetor overhaul, transmission repair, suspension fork service, brake caliper rebuild, electrical component testing and replacement, clutch service
Troubleshooting:
Diagnostic procedures for common issues (e.g., no spark, starting problems, performance issues), error code interpretation (if applicable), detailed problem-solving guides
Installation Adjustment:
Throttle cable adjustment, brake lever adjustment, suspension setup, installation of various components, starter adjustment, idle adjustment
Engine Components:
Detailed procedures for dismantling, inspecting, and rebuilding engine components such as the cylinder, piston, rings, connecting rod, crankshaft, and bearings.
Carburetor Tuning:
Instructions on cleaning, rebuilding, adjusting jets (main, slow/pilot), and setting the idle speed and mixture screw.
Suspension Adjustment:
Guidance on adjusting suspension settings, servicing forks and rear shock absorbers, and potential rebuild procedures.
Electrical Schematics:
Includes wiring diagrams and electrical system schematics for troubleshooting and repair of the ignition, lighting, and charging systems.
Technical Depth
Depth:
Comprehensive (from basic maintenance to full engine/component rebuilds)
Diagnostic Level:
Advanced diagnostics with schematics and troubleshooting flowcharts
Illustrations:
Illustrated with clear step-by-step instructions, zoomable illustrations, exploded views, detailed component breakdowns
Manual Style:
Factory service manual equivalent, providing detailed technical information for mechanics.
📊 Manual Specifications
File Format
Format:
PDF (Portable Document Format) - also potentially ZIP, RAR, or EXE for delivery
File Delivery Method:
Instant download after payment completion, with a limited download window (three days).
Print Quality
Printability:
Printable without restrictions
Binding Type
Binding:
Not Applicable (Digital Download)
Paper Type
Paper Type:
Not Applicable (Digital Download)
File Size Considerations
Storage Requirements:
Up to 5GB (user advised to check storage space)
Accessibility
Operating Systems:
Compatible with all operating systems (Windows, Linux, Mac)
Software Requirements:
Requires a PDF reader; may require WinZip or WinRAR for unzipping
⚙️ Engine Specifications
Primary Engine
Engine Type:
2-stroke, single-cylinder
Displacement:
236cc
Bore X Stroke:
68.0 mm x 64.0 mm
Cooling System:
Liquid-cooled
Compression Ratio:
6.8:1 (typical, may vary slightly by region)
Ignition System Type:
CDI (Capacitor Discharge Ignition)
Performance
Horsepower:
Approx. 37-40 HP (estimated, not explicitly stated in product info but typical for this class)
Torque:
Refer to manual for specific torque specifications
Fuel System
Carburetor Type:
Mikuni VM34SS
Fuel Type:
Unleaded gasoline (minimum 91 octane recommended)
Oil Mixture:
20:1 ratio (premix fuel/oil) - consult manual for specific oil type (e.g., Yamalube 2R or equivalent 2-stroke oil)
🔧 Transmission
Standard
Transmission Type:
6-speed constant mesh
Clutch Type:
Wet, multi-plate
Features
Drive System:
Chain drive
📐 Dimensions
Weights
Dry Weight:
Approx. 160 kg (353 lbs)
Fuel Capacity:
Approx. 10.0 L (2.6 US gal)
🛡️ Safety Features
Ratings
Safety Certification:
Conforms to EPA and ANSI safety standards for ATVs
Active Features
Braking System:
Hydraulic disc brakes front and rear
Passive Features
Frame Construction:
Steel frame for durability and rigidity
💡 Technology Features
Infotainment
Infotainment System:
Not Applicable (Basic ATV technology of the era)
Driver Assistance
Driver Assistance Features:
Not Applicable
Connectivity
Connectivity Features:
Not Applicable
🔧 Maintenance
Service Intervals
Oil Change Interval:
Refer to manual for specific intervals based on usage (e.g., every 20 hours of operation or annually)
Spark Plug Replacement:
Refer to manual for recommended replacement intervals (typically based on hours or mileage)
Air Filter Cleaning:
Frequent inspection and cleaning recommended, especially in dusty conditions (refer to manual for schedule)
Fluid Specifications
Engine Oil Type:
2-stroke oil (premix ratio 20:1, e.g., Yamalube 2R or API TC, JASO FD certified)
Transmission Oil Type:
Yamaha Gear Oil (or equivalent SAE 10W-30 API GL-4 transmission oil)
Coolant Type:
Yamaha Coolant (or equivalent permanent type antifreeze/coolant with corrosion inhibitors)
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid
Coolant Capacity:
Refer to manual for specific coolant capacity
Known Issues
Carburetor Icing:
Can occur in cold, humid conditions due to fuel atomization cooling the carburetor body.
Clutch Wear:
As with any performance ATV, clutch wear can be accelerated with aggressive riding.
Electrical Connections:
Corrosion or loose connections can lead to intermittent electrical issues.
Maintenance Tips
Post Ride Care:
Crucial to clean air filter, check chain lube, and inspect for damage after each ride, especially in off-road conditions.
📚 Vehicle History
Brand Heritage
Yamaha Powersports:
Yamaha has a long history of producing innovative and high-performance powersports vehicles, including motorcycles and ATVs.
Model Evolution
Tri Z Lineage:
The Tri-Z was Yamaha's flagship performance ATV of its era, building on the success of earlier models and setting benchmarks for speed and handling.
Production
Production Period:
The Yamaha Tri-Z 250 was produced from 1985 to 1988.
🏆 Awards & Recognition
Recognitions
Industry Impact:
The Tri-Z was highly regarded in its time for its racing prowess and performance, contributing significantly to the evolution of sport ATVs.
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