This workshop and repair manual provides comprehensive guidance for Yamaha Moto 4 ATVs, covering models 250 and 350 produced between 1987 and 1995. Yamaha has a strong legacy in ATV manufacturing, and the Moto 4 series was a significant contributor, known for its durability and reliable performance in both work and recreational applications. These ATVs are characterized by their air-cooled, single-cylinder, 4-stroke engines, manual transmissions with clutches, and robust chassis designed for versatility.
This manual is designed to be an indispensable resource for DIY mechanics, ATV enthusiasts, and owners. It offers in-depth, professional-quality information for all servicing, maintenance, and repair jobs. Key areas covered include detailed engine overhaul, transmission service, electrical system diagnostics, chassis maintenance, and bodywork. With clear, step-by-step instructions and diagrams, this English-language PDF manual empowers users to perform routine servicing, address common issues, and undertake complete rebuilds, ultimately promoting cost savings and ensuring the longevity of their Yamaha Moto 4.
Product Type:
Workshop & Repair Manual
Target Audience:
DIY mechanics, ATV enthusiasts, owners seeking to perform their own maintenance and repairs.
Value Proposition:
Cost savings by enabling users to perform repairs themselves, avoiding expensive mechanic fees.
Ease Of Use:
Easy-to-follow step-by-step instructions, clear visuals, and diagrams.
Content Focus:
Comprehensive coverage of all servicing, maintenance, and repair jobs.
Delivery Method:
Instant digital download upon payment.
General Coverage:
All models and engine types for the specified years.
Estimated Page Count:
N/A (Digital Download)
Type:
Complete Workshop & Repair Manual
Engine:
Detailed engine overhaul, tuning, carburetor repair, ignition system, lubrication system.
Transmission:
Gearbox inspection, repair, clutch service, final drive maintenance.
Electrical:
Wiring diagrams, lighting system, starting system, charging system, ignition troubleshooting.
Chassis:
Suspension, steering, brakes, wheels, tires, frame inspection.
Bodywork:
Panel removal and installation, plastic components, seat maintenance.
Maintenance:
Routine servicing, oil changes, filter replacements, spark plug checks, chain adjustment.
Repair:
Step-by-step repair instructions for all major and minor components.
Troubleshooting:
Diagnostic procedures for common problems and symptoms.
Rebuilds:
Complete engine and transmission rebuild procedures.
Depth:
Professional quality, in-depth service and repair information.
Compatibility:
PC, MAC, Tablets & Smartphones (Win/MAC/Linux)
Binding:
N/A (Digital Download)
Paper:
N/A (Digital Download)
Type 250:
Likely air-cooled, single-cylinder, 4-stroke (specific displacement and bore/stroke vary by exact sub-model within the Moto 4 250 range).
Type 350:
Likely air-cooled, single-cylinder, 4-stroke (specific displacement and bore/stroke vary by exact sub-model within the Moto 4 350 range).
Horsepower Range 250:
Estimated 15-20 HP (typical for this class and era).
Horsepower Range 350:
Estimated 20-25 HP (typical for this class and era).
Carburetion:
Typically Mikuni or Keihin constant velocity (CV) carburetors; specific models vary. Manual covers cleaning, adjustment, and overhaul.
System:
CDI (Capacitor Discharge Ignition); details on spark plug type, gap, and timing adjustments are expected.
System:
Wet sump; covers oil type, capacity, filter replacement intervals, and troubleshooting oil pressure issues.
Type:
Manual transmission with clutch and typically a high/low range gearbox or multi-speed transmission.
Features:
Reverse gear is a common feature on these models.
Clutch Type:
Wet, multi-plate clutch; includes service procedures for adjustment and replacement.
Transmission Oil:
Typically SAE 10W-30 or 20W-40 motorcycle gear oil or equivalent; manual will specify exact API classification and capacity.
Type:
Shaft drive or chain drive depending on specific model variation; manual covers lubrication and maintenance for both.
Overall Length:
N/A (Varies by sub-model, but typically around 1900-2000 mm)
Overall Width:
N/A (Varies by sub-model, but typically around 1000-1100 mm)
Overall Height:
N/A (Varies by sub-model, but typically around 1100-1200 mm)
Dry Weight Approx:
N/A (Varies by sub-model, but typically in the 200-230 kg range)
Payload Capacity:
N/A (Typically around 150-200 kg)
Atv Safety Standards:
Manual will reference relevant safety guidelines for ATV operation and maintenance of safety-critical systems.
Braking System:
Hydraulic disc brakes front and rear; manual covers inspection, pad replacement, fluid bleeding, and hydraulic system maintenance.
Lighting:
Headlights, taillights, brake lights; manual covers bulb replacement and electrical checks.
Frame Construction:
Steel frame; manual covers inspection for damage and integrity.
Tyres:
All-terrain tires; manual will cover recommended pressures and inspection for wear.
Features:
Basic functionality focusing on essential controls and indicators, not advanced infotainment systems.
Features:
None in the modern sense; focus is on mechanical and electrical systems.
Oil Change Interval:
Typically every 30-60 hours of operation or annually; manual will provide specific guidance.
Air Filter Cleaning:
Recommended every 10-20 hours of operation, depending on operating conditions.
Spark Plug Check:
Recommended at scheduled intervals, usually annually or every few thousand miles/hours.
Engine Oil Type:
Yamaha recommends specific motorcycle-grade oils, typically SAE 10W-30 or 20W-40, with API SG or higher. Manual will detail exact specification.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid; manual will specify.
Gear Oil:
SAE 80 or 85W hypoid gear oil for the final drive and gearbox (if separate); manual will specify.
Carburetor Clogging:
Common in older ATVs due to fuel sitting; manual provides detailed cleaning and tuning procedures.
Suspension Wear:
Bushings and seals can wear over time; manual details inspection and replacement.
Electrical Connector Corrosion:
Outdoor exposure can lead to corrosion; manual aids in diagnosing and cleaning connections.
Yamaha Atv Legacy:
Yamaha has a long history of producing reliable and capable ATVs, with the Moto 4 line being a significant contributor to their off-road market presence.
Moto 4 Development:
The Moto 4 series evolved through the late 80s and early 90s, refining engine performance, suspension, and chassis design for versatility in work and recreation.
Manufacturing Era:
Primarily manufactured during a period of significant growth and popularity for ATVs.
Industry Reputation:
Yamaha Moto 4 series was well-regarded for its durability and reliable performance within its class during its production run.
