Market Segment:
Performance-oriented sport ATV of its era.
Competitors Era:
Competed with other high-performance sport ATVs from brands like Honda (e.g., TRX250R) and Suzuki.
Key Features Vehicle:
High-revving 2-stroke engine, advanced suspension for its time, sport-focused ergonomics.
Manual Value:
Essential resource for owners and technicians, providing factory-level diagnostic and repair information, mirroring what dealers use.
Engine System:
Complete engine overhaul, diagnosis, repair, and tuning for the 246cc two-stroke engine.
Carburetion System:
Detailed carburetor adjustment, cleaning, rebuilding, and jetting information.
Chassis System:
Suspension, steering, frame, swingarm, and wheel bearing service and adjustments.
Electrical System:
Ignition system, lighting, battery, starter, and component testing and troubleshooting.
Cooling System:
Air cooling system checks and maintenance.
Exhaust System:
Pipe and silencer inspection and maintenance.
Drive System:
Chain, sprockets, and clutch inspection and service.
Braking System:
Front and rear brake caliper, master cylinder, and hydraulic system maintenance.
Fuel System:
Fuel tank, petcock, and fuel line service.
Maintenance Procedures:
Scheduled maintenance, lubrication, filter changes, and general upkeep.
Repair Procedures:
Step-by-step instructions for engine rebuilds, transmission repairs, and component replacements.
Troubleshooting Procedures:
Diagnostic flowcharts and symptom-based troubleshooting guides for common problems.
Wiring Diagrams:
Detailed electrical wiring schematics for fault diagnosis and repair.
Depth Of Information:
Provides in-depth technical information suitable for dealership technicians and experienced DIY mechanics.
Rebuild Guidance:
Includes comprehensive guidance for complete engine and transmission rebuilds.
Diagnostic Capabilities:
Offers advanced diagnostic procedures for electrical and mechanical issues.
File Format:
PDF (Portable Document Format)
Searchability:
Searchable text for quick information retrieval.
Print Quality Recommendation:
Optimized for digital viewing; high-resolution scans ensure clarity for printing.
Binding Type:
Not Applicable (Digital Download)
Paper Type:
Not Applicable (Digital Download)
Engine Type:
2-stroke, reed valve, single-cylinder
Displacement:
239cc (or 246cc for some model years/variants)
Bore X Stroke:
68.0 mm x 64.0 mm
Cooling System:
Air-cooled
Ignition:
CDI (Capacitor Discharge Ignition)
Horsepower:
Approximately 30-35 HP (estimated, varies by year and tuning)
Torque:
Not explicitly stated in basic specs, but characteristic of its class.
Fuel Type:
Unleaded gasoline mixed with 2-stroke oil (premix or oil injection system)
Carburetor Model:
Mikuni VM34SS (likely, specific to model year variations)
Overall Length:
Approx. 70.3 inches (1785 mm)
Overall Width:
Approx. 44.3 inches (1125 mm)
Overall Height:
Approx. 42.7 inches (1085 mm)
Dry Weight:
Approx. 346 lbs (157 kg)
Fuel Capacity:
Approx. 2.4 gallons (9.0 L)
Oil Capacity Transmission:
Refer to manual for specific quantities (typically GL-4 or GL-5 gear oil).
Oil Change Interval:
Refer to manual for specific recommendations based on usage (e.g., every 30-40 hours or annually).
Spark Plug Replacement:
Refer to manual (e.g., annually or every 100-200 hours).
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions.
Chain Lubrication Adjustment:
Regularly, as needed, based on usage and environment.
Transmission Fluid Type:
Yamaha recommends specific gear oil (e.g., Yamalube Gear Oil) or equivalent GL-4/GL-5 rated gear oil. Consult manual for exact specification and capacity.
2 Stroke Oil Type:
High-quality 2-stroke oil, specifically formulated for air-cooled, high-performance engines. JASO FD or higher is generally recommended. Consult manual for specific ratio if premixing.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (ensure consistency).
Common Issues:
Carburetor clogging, reed valve wear, suspension seal leaks, CDI unit failures, and general wear and tear on high-performance components.
Maintenance Priority:
Proper carb cleaning and jetting, regular chain maintenance, and checking for air leaks in the intake tract are crucial for optimal performance.
Yamaha Atv Heritage:
Yamaha has a long history of producing innovative and performance-oriented ATVs, starting with the revolutionary 1980 YFM125 Moto-Sport.
Tri Z Lineage:
The TRI-Z 250 was Yamaha's flagship sport ATV, known for its powerful two-stroke engine and racing pedigree. It evolved from earlier 200cc models and paved the way for future performance ATVs.
Production Years:
1984-1988 (with updates and variations within these years)
Manufacturing Location:
Japan (Typical for Yamaha ATVs of this era)
