Segment:
High-performance sport ATV
Target Audience:
Enthusiasts seeking to maintain, repair, and optimize their Yamaha Tri-Z 250
Competitors:
Honda TRX series, Suzuki QuadRacer LT series, Kawasaki Bayou series
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.
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
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
Depth:
Comprehensive coverage suitable for both DIY enthusiasts and professional mechanics, covering everything from basic maintenance to full engine and transmission rebuilds.
Searchability:
Searchable text for quick access to information
Quality:
Identical to original printed manuals, includes clear illustrations and diagrams
Type:
N/A (Digital - printable pages)
Type:
N/A (Digital - printable pages)
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)
Horsepower Estimated:
Approximately 27-30 hp (stock)
Torque Estimated:
Not explicitly stated, but strong mid-range power delivery
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)
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
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
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.
Legacy:
Yamaha has a long and successful history in powersports, known for innovation and performance, particularly in 2-stroke technology.
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 Years:
1985-1988
Manufacturing Location:
Japan
