🏷️ Basic Information

Make:

Yamaha

Model:

YTZ250N TRI-Z

Variant:

250

Model Code:

YTZ250N

👋 Introduction

Market Position:

The Yamaha YTZ250N TRI-Z was a high-performance, race-oriented ATV designed for motocross and off-road competition, known for its agility and power.

Key Features:

This manual is tailored specifically for the YTZ250N TRI-Z, providing detailed, make-model-year specific information, unlike generic manuals. It offers in-depth coverage for comprehensive repair and maintenance.

📋 Manual Details

Coverage Overview:

Comprehensive workshop repair procedures for the Yamaha YTZ250N TRI-Z 250, covering all aspects of maintenance, repair, and diagnostics.

Specific Sections Detailed:

General Information, Lubrication, Inspection and Adjustment, Fuel System, Engine Removal/Installation, Cylinder Head/Valve, Cylinder/Piston, Clutch, Gearshift Linkage, Sub transmission, Crankcase, Transmission, Crankshaft/Primary shaft, Front Wheel/Suspension, Rear Wheel/Suspension, Hydraulic Brake, Battery/Charging System, Ignition System, Electric Starter, Switches, Technical Features, Troubleshooting.

Estimated Page Count:

Estimated 300-500 pages (typical for comprehensive service manuals of this era).

Manual Type:

Service Repair Manual / Workshop Manual

Manual Purpose:

Designed for owners and technicians to perform all repairs and maintenance tasks.

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine Systems:

Engine removal/installation, cylinder head/valve service, cylinder/piston service, clutch, gearshift linkage, sub-transmission, crankcase, transmission, crankshaft/primary shaft.

Chassis Systems:

Front wheel/suspension, rear wheel/suspension, hydraulic brakes.

Electrical Systems:

Battery/charging system, ignition system, electric starter, switches, electrical diagrams.

Maintenance Procedures:

General maintenance, lubrication, inspection, adjustment, fluid capacities, re-wiring.

Repair Procedures:

Step-by-step repair instructions for all covered systems, including engine rebuilding.

Diagnostic Procedures:

Troubleshooting guides and procedures.

Technical Depth:

Extensive technical detail, suitable for professional mechanics and experienced DIY enthusiasts, covering everything from basic adjustments to complete engine and component rebuilds.

Diagnostic Tools Required:

While not explicitly stated, general automotive/ATV tools and potentially specialized ignition testers or torque wrenches would be beneficial for certain procedures.

📊 Manual Specifications

File Format:

PDF

File Compatibility:

PC/MAC Compatible

Digital Features:

Zoom In/Out functionality

Searchable Text:

PDF format often allows for text searching, enhancing usability for specific terms or parts.

Delivery Method:

Instant Download

Print Quality:

Printable pages (user selectable printing of sections or entire manual)

⚙️ Engine Specifications

Engine Type:

Two-stroke, single-cylinder

Displacement:

239cc (This is a common displacement for this model; specific 'N' variant might have slight variations but this is a strong indicator).

Bore X Stroke:

Refer to manual for exact specifications (typically around 66mm x 70mm for 239cc).

Cooling System:

Liquid-cooled

Horsepower:

Refer to manual for specific output (typically around 25-30 HP, depending on tuning).

Torque:

Refer to manual for specific output.

Ignition System Type:

CDI (Capacitor Discharge Ignition) with a 12V battery/generator system.

Carburetor:

Single Mikuni VM series carburetor (e.g., VM34SS or similar, manual will specify exact type and jetting).

Fuel Type:

Unleaded gasoline (typically 91 octane or higher recommended, refer to manual for exact recommendation).

Fuel Mixture:

Pre-mix (2-stroke oil mixed with gasoline), ratio specified in manual (commonly 20:1 or 32:1).

Cylinder Head Design:

Aluminum alloy cylinder head, likely featuring a hemispherical combustion chamber for performance.

🔧 Transmission

Transmission Type:

6-speed manual transmission with constant mesh.

Clutch Type:

Wet, multi-disc clutch.

Final Drive:

Chain drive.

Transmission Oil Type:

Yamalube 2R or equivalent 2-stroke oil (for premix) and Yamalube Gear Oil or equivalent (for transmission/clutch lubrication, manual will specify viscosity and API rating).

📐 Dimensions

Overall Length:

Refer to manual (typical for this era: approx. 1850-1950 mm).

Overall Width:

Refer to manual (typical for this era: approx. 750-800 mm).

Overall Height:

Refer to manual (typical for this era: approx. 1050-1100 mm).

Wheelbase:

Refer to manual (typical for this era: approx. 1200-1250 mm).

Ground Clearance:

Refer to manual (typically around 150-200 mm).

Dry Weight:

Refer to manual (typically around 150-160 kg).

Fuel Capacity:

Refer to manual (typically 9-11 liters).

🛡️ Safety Features

Safety Features:

Designed for closed-course competition, not street legal. Safety features focus on operational performance and control inherent to the vehicle's design (e.g., reliable braking, stable chassis).

💡 Technology Features

Infotainment System:

Not applicable. This is a performance-oriented ATV with minimal electronic amenities, focusing on core riding functions.

Driver Assistance Features:

Not applicable.

Connectivity Options:

Not applicable.

🔧 Maintenance

Oil Change Interval:

Transmission oil: Refer to manual (typically every 20-30 hours of operation or annually).

Spark Plug Replacement:

Refer to manual (typically every 30-50 hours or annually, depending on usage).

Air Filter Cleaning:

Refer to manual (frequently, depending on operating conditions, e.g., every few rides).

Transmission Oil Spec:

Yamalube Gear Oil (SAE 80W or SAE 80W-90 GL-4 recommended) or equivalent.

Coolant Type:

Permanent type anti-freeze coolant (50/50 mix with distilled water). Refer to manual for specific Yamaha coolant type or recommended alternatives.

Brake Fluid Type:

DOT 3 or DOT 4 brake fluid (refer to manual for precise specification).

Premix Oil Spec:

Yamalube 2R or equivalent high-performance two-stroke oil, mix ratio specified in manual (e.g., 20:1, 32:1).

Common Issues:

Typical issues for high-performance two-stroke ATVs of this era can include carburetor tuning, clutch wear, reed valve performance, top-end engine wear (piston/rings), and suspension component maintenance. The manual will provide specific diagnostic and repair steps for these.

Maintenance Focus Areas:

Proper two-stroke oil mixing, regular air filter cleaning, and careful clutch operation are critical for longevity.

📚 Vehicle History

Brand Heritage:

Yamaha has a strong heritage in motorsport, particularly in motorcycle and ATV racing, known for innovation and performance-driven engineering.

Model Evolution:

The YTZ250 TRI-Z was part of Yamaha's aggressive push into the performance ATV market in the 1980s, building on their experience with two-stroke engines and racing technology. It was a significant competitor in its class.

Model Identifier Significance:

The YTZ250 TRI-Z name signifies Yamaha's three-wheel ATV lineage, though the 'N' designation likely refers to a four-wheel variant or a specific update to the TRI-Z platform. The manual's coverage of 'Front Wheel/Suspension' and 'Rear Wheel/Suspension' confirms it pertains to a four-wheel ATV.

Production Years:

The YTZ250 TRI-Z model line was produced primarily in the mid-to-late 1980s (e.g., 1985-1988). The 'N' designation typically refers to a specific model year or configuration within that range.