Model Variants Covered:
YFM200, YFM200N, YFM200DXS Moto-4, YFM200DXT Moto-4 Shaft Reverse, YFM200DXU Moto-4 Shaft Reverse
Product Type:
Repair Manual / Factory Service Manual
Model Years Covered:
1984, 1985, 1986, 1987, 1988
Product Name:
1984-1988 Yamaha YFM200 Moto-4 Repair Manual
Vehicle Segment:
Entry-level to mid-range All-Terrain Vehicle (ATV), popular for recreational use and light utility tasks in its era.
Competitors:
Competed with other ATVs of similar displacement from brands like Honda (e.g., TRX200), Suzuki (e.g., LT230), and Kawasaki (e.g., KLF220).
Vehicle Strengths:
Known for its reliable air-cooled engine, shaft drive (offering reduced maintenance compared to chain drive), and comfortable rider ergonomics for its class. The reverse gear on DX models was a significant advantage.
Engine Mechanical:
Comprehensive coverage including disassembly, inspection, repair, and reassembly of engine components (pistons, rings, cylinders, crankshaft, camshaft, valves, etc.).
Fuel Delivery:
Detailed instructions for the carburetor (cleaning, adjustment, jetting), fuel lines, fuel pump (if applicable), and fuel tank.
Lubrication System:
Information on oil pump, oil passages, oil filter, and oil change procedures.
Cooling System:
Details on air cooling system, including shrouding, fins, and any related components.
Ignition System:
Coverage of CDI unit, ignition coil, spark plug, and related wiring.
Transmission And Drivetrain:
In-depth procedures for transmission overhaul, clutch operation, and final drive system maintenance (shaft drive).
Suspension System:
Front and rear suspension component removal, installation, and service, including shock absorbers and linkages.
Steering System:
Steering column, tie rods, and steering linkage maintenance and repair.
Braking System:
Front and rear brake component service, including hydraulic lines, master cylinders, calipers, brake shoes/pads, and drums/rotors.
Electrical Components:
Headlight, taillight, turn signals, battery, starter motor, lighting, and accessory electrical system service.
Chassis And Body:
Frame inspection, plastic body panel removal and installation, seat, and fender service.
Disassembly And Assembly:
Step-by-step procedures for removing, installing, and reassembling all major vehicle components and systems.
Routine Maintenance:
Detailed guidance on oil changes, filter replacements, spark plug service, air filter cleaning, lubrication points, and general inspections.
Troubleshooting Guides:
Diagnostic procedures for identifying and resolving common mechanical and electrical issues, often presented in a symptom-based format.
Technical Specifications:
Crucial data like torque specifications, clearances, timing settings, electrical resistances, and fluid capacities.
Diagrams And Illustrations:
Exploded views of components, assembly diagrams, and illustrative pictures to aid in repair and identification.
Electrical Diagnostics:
Methods for testing circuits, components, and diagnosing electrical faults using multimeters and wiring diagrams.
Depth:
Comprehensive, covering everything from basic maintenance to complete engine and transmission overhauls. Designed for skilled technicians and advanced DIY enthusiasts.
Engine Type:
Air-cooled, 4-stroke, SOHC
Engine Displacement:
196cc (approximately, based on common YFM200 specifications)
Bore X Stroke:
Typically around 61.0 mm x 67.0 mm (verify specific model for exact figures)
Compression Ratio:
Likely in the range of 8.7:1 to 9.5:1 (verify specific model)
Horsepower:
Estimated 14-17 HP (at the crankshaft, for its era)
Torque:
Estimated 11-13 lb-ft (at the crankshaft, for its era)
Carburetor Type:
Mikuni VM Series (likely VM26 or similar, verify specific model)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
Typically around 2.0-2.5 gallons (verify specific model)
Engine Oil Change:
Typically every 1000 km or 6 months; manual will provide precise intervals and oil type.
Spark Plug Maintenance:
Check and clean/replace every 2000 km or annually; manual will specify type and gap.
Air Filter Cleaning:
Clean every 1000 km, replace as needed; manual will detail type and procedure.
Engine Oil Type:
Yamalube or equivalent SAE 10W-30 or 10W-40 API SE or SF classification (verify specific grade and specs in manual).
Gear Oil Type:
Yamaha Genuine Gear Oil or SAE 80 API GL-4 (verify in manual).
Carburetor Fouling:
Common with age and infrequent use, requiring cleaning and adjustment.
Shaft Drive Maintenance:
While generally reliable, requires periodic inspection and lubrication of universal joints and final drive.
Electrical Connector Corrosion:
Can occur due to exposure to elements, leading to intermittent electrical issues. Manual's wiring diagrams are crucial for diagnosis.
Suspension Wear:
Bushings and shock absorbers may wear over time, affecting ride quality and handling.
