1986-1988 Yamaha Moto-4 225 YFM Service Manual

1986–1988 Yamaha YFM 225 Moto-4 Service Manual

• Covers 1986–1988 Yamaha YFM 225 Moto-4 ATV including 2WD chassis and engine systems
• Official OEM publication with P/N prefix 59V and JY459V serial range identification
• Contains 47 exploded-view diagrams, 8 detailed torque specification tables, and 17 specialized tool references
• File downloads to your account within seconds of checkout
• Permanent availability in your purchase account — no re-buy required
• Laid out for standard letter and A4 printing
• Full-text search finds any part number in seconds
• This 251-page factory document is the authoritative source for engine, electrical, and transmission tolerances on the 59V-series build

Documentation Walkthrough

This 1986–1988 Yamaha YFM 225 Moto-4 publication provides detailed information for machine maintenance. The structure includes chapters on general vehicle identification, periodic inspection parameters, and engine overhaul, alongside dedicated sections for carburetion, chassis maintenance, and electrical systems. Appendices summarize the necessary specifications for major service operations, including gear lash settings and component clearances.

Engine and Chassis Specifications

Technical content documents vital data such as the 1,400 ± 50 r/min idle speed requirement for the YFM 225 engine. The 1986–1988 Yamaha YFM 225 Moto-4 manual also lists torque values for components like the cylinder head bolts, oil pump, and crankcase screws. Intake valve clearance for the 1986–1988 Yamaha YFM 225 Moto-4 is listed at 0.05–0.09 mm in the cylinder head specification table. Compression pressure at sea level is documented as 883 kPa for standard operation. The 1986–1988 Yamaha YFM 225 Moto-4 spark plug gap is specified at 0.6–0.7 mm in the technical data section. This reference publication acts as a source for understanding what an OEM service publication covers regarding internal tolerances and maintenance cycles. All data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work.

An official 251-page Yamaha OEM service manual covering the 1986–1988 Yamaha YFM 225 Moto-4, documenting engine, chassis, electrical, and fuel-delivery specifications for the 59V-series platform.