Product Type:
Complete Workshop Service Repair Manual
Applicable Years:
1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995
Vehicle Type:
All-Terrain Vehicle (ATV)
Positioning:
The Yamaha Moto-4 series was positioned as a reliable and capable utility ATV for recreational and light work applications during its production run.
Competitors:
Competed against models from Honda (e.g., TRX250, TRX300), Suzuki (e.g., QuadRunner series), and Kawasaki (e.g., Bayou series) during the late 1980s and 1990s.
Ease Of Use:
Features easy-to-follow step-by-step instructions and numerous pictures to simplify repair and maintenance tasks.
Accessibility:
Instant email delivery upon payment, usable on various devices (PC, Mac, tablets, smartphones).
Cost Saving:
Enables owners to perform their own repairs, significantly reducing labor costs.
Coverage:
Comprehensive; All Models/Engines/Trim/Transmissions Types Covered
Page Count:
Undisclosed (estimated to be extensive due to 'A-Z' coverage)
Type:
Workshop Service Repair Manual
Format:
Downloadable Digital Format (PDF compatible)
Engine:
Engine overhaul, disassembly, assembly, tuning, diagnostics, lubrication system, cooling system, fuel system, exhaust system.
Transmission:
Transmission overhaul, disassembly, assembly, clutch service, gearbox repair, final drive.
Electrical:
Ignition system, starting system, charging system, lighting system, wiring diagrams, battery service, troubleshooting electrical faults.
Chassis:
Frame, suspension (front and rear), steering system, wheels, tires, brakes (front and rear).
Bodywork:
Body panels, fenders, seat, controls, decals, general maintenance.
Troubleshooting:
Diagnostic procedures for common and uncommon issues, fault finding charts.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain lubrication and adjustment, brake pad inspection, tire pressure checks.
Repair:
Complete repair procedures for all major and minor components, from engine rebuilds to electrical system fixes.
Disassembly Assembly:
Detailed step-by-step instructions for taking apart and putting back together all vehicle systems and components.
Tuning Adjustment:
Carburetor tuning, ignition timing adjustments, suspension adjustments.
Depth:
Comprehensive; suitable for both novice DIY mechanics and experienced technicians. Covers basic maintenance to complex engine and transmission rebuilds.
Engine Type 250:
Four-stroke, SOHC, air-cooled
Displacement 250:
230cc - 246cc (exact figure varies by specific model year revision)
Bore X Stroke 250:
Approximately 69mm x 64mm (typical for this displacement class, specific values in manual)
Compression Ratio 250:
Around 9.2:1 to 10.2:1 (manual will specify exact)
Engine Type 350:
Four-stroke, SOHC, air-cooled
Displacement 350:
348cc - 350cc (exact figure varies by specific model year revision)
Bore X Stroke 350:
Approximately 80mm x 69mm (typical for this displacement class, specific values in manual)
Compression Ratio 350:
Around 8.4:1 to 9.2:1 (manual will specify exact)
Horsepower Estimate 250:
Approx. 16-20 HP (manual will provide precise figures)
Horsepower Estimate 350:
Approx. 22-26 HP (manual will provide precise figures)
Carburetor:
Single Mikuni carburetor (specific model number provided in manual for both 250 and 350 variants).
Fuel Type:
Unleaded gasoline (manual specifies octane rating requirement).
Type:
5-speed manual transmission with automatic clutch (sometimes referred to as a 'semi-automatic' or 'wet multi-plate' clutch).
Drive System:
Shaft drive (2WD).
Reverse:
Yes (typically integrated into the transmission).
Clutch Type:
Automatic centrifugal clutch.
Gear Ratios:
Specific gear ratios for each gear and reverse are detailed in the manual.
Transmission Oil Type:
Yamaha recommends specific API SG or SH, SAE 10W-40 or 20W-40 viscosity motor oil (confirm with manual).
Length Estimate:
Approx. 75-80 inches (specific dimensions provided in manual).
Width Estimate:
Approx. 40-45 inches (specific dimensions provided in manual).
Height Estimate:
Approx. 40-45 inches (specific dimensions provided in manual).
Dry Weight Estimate:
Approx. 400-450 lbs (specific figures for 250 and 350 models in manual).
Ground Clearance Estimate:
Approx. 6-8 inches (manual will detail exact clearance).
Safety Standards:
Manufactured to meet ATV safety standards of the era; manual covers safe operating procedures and recommended safety gear.
Braking System:
Front: Drum or disc brakes (varies by model year). Rear: Drum or disc brake (varies by model year). Manual details specific brake system components and maintenance.
Lighting:
Headlight, taillight, and brake light for visibility and signaling.
Handlebars:
Wide handlebars for control and stability.
Seat:
Contoured seat for rider comfort and positioning.
Features:
Basic functionality focused on operation. Features include standard handlebar controls, speedometer/odometer (model dependent), and indicator lights.
Features:
None (ATV of this era did not incorporate advanced driver assistance systems).
Features:
None (basic mechanical and electrical systems).
Oil Change Interval:
Typically every 1,000 km or 6 months, but the manual will provide the definitive schedule based on usage. (e.g., every 100 hours of operation is common for ATVs).
Spark Plug Replacement:
Recommended at 3,000-6,000 km or annually; manual will specify plug type and gap. (e.g., NGK CR7E or similar, check manual for exact).
Air Filter Cleaning:
Frequent cleaning/replacement recommended, especially in dusty conditions. Manual details frequency and cleaning method (e.g., washing and re-oiling).
Chain Lubrication Adjustment:
Lubricate chain every 500 km or after riding in wet conditions. Adjust tension as per manual specifications (typically 15-25mm slack).
Engine Oil Capacity 250:
Approximately 1.7-2.0 Liters (refer to manual for exact capacity and fill level check procedure).
Engine Oil Capacity 350:
Approximately 1.9-2.2 Liters (refer to manual for exact capacity and fill level check procedure).
Coolant Type:
Air-cooled engines, no coolant required.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (confirm with manual for specific caliper/master cylinder requirements).
Carburetor Issues:
Clogged jets due to fuel degradation, particularly if the ATV sits for extended periods. Manual provides cleaning and adjustment procedures.
Starter Clutch Wear:
Can experience wear over time, leading to slipping or failure to engage. Manual details inspection and replacement.
Suspension Bushings:
Rubber bushings in suspension and swingarm can degrade, causing play and poor handling. Manual guides replacement.
Electrical Connections:
Corroded or loose electrical connectors can cause intermittent issues. Manual aids in tracing and cleaning connections.
Yamaha Atv History:
Yamaha has a long and successful history in the ATV market, pioneering many innovations and consistently producing reliable off-road vehicles.
Moto 4 Introduction:
The Moto-4 line was introduced in the mid-1980s, offering a robust and user-friendly ATV platform that evolved throughout its production run.
Key Updates:
Updates across the 1987-1995 period likely included minor engine tuning, chassis refinements, updated styling, and potentially brake system improvements, all detailed within the manual.
Production Era:
Late 1980s to mid-1990s.
