1986-1988 Yamaha YFM225 Moto 4 ATV Service Manual

Yamaha YFM225 Moto 4 1986–1988 Workshop Manual

• Covers 1986–1988 Yamaha YFM225 Moto 4 ATVs, including chassis, engine, and electrical system diagnostics for the YFM225S model
• Official Yamaha publication P/N LIT-11616-04-83, 1st Edition February 1985
• Contains dozens of technical exploded-view diagrams, torque reference tables, and wiring system schematics
• Delivered as a direct download the moment payment clears
• Stored against your account so you can retrieve it after a hard-drive loss
• Full-text search finds any part number in seconds
• Laid out for standard letter and A4 printing
• This 1st edition original factory publication provides the foundation for all subsequent 1986–1988 YFM225 service and maintenance intervals.

Documentation Overview

This factory service publication provides technical data for the 1986–1988 Yamaha YFM225 Moto 4 series. The manual details general machine identification, periodic inspection routines, and complete engine overhaul procedures. It covers engine removal, disassembly of the cylinder head, transmission, and clutch assembly, along with detailed specifications for inspection and repair of internal components. Electrical systems are documented for troubleshooting, while chassis sections explain brake adjustments, steering inspection, and suspension settings. Appendices provide additional supporting data for technicians and advanced owners.

Technical Reference and Specifications

The 1986–1988 Yamaha YFM225 Moto 4 service manual contains extensive technical tables for routine maintenance and internal clearances. Detailed torque values for critical fasteners are specified throughout, such as the 43 Nm required for the drain plug and 15 Nm for clutch cover components. Intake valve clearance for the 1986–1988 Yamaha YFM225 is listed at 0.05–0.09 mm in the cylinder head specification table. Compression pressure at sea level for the YFM225 is documented at 883 kPa standard. Fuel capacity for the final gear assembly is 0.23 liters of SAE 80 API GL-4 gear oil. Reference this manual to understand how factory workshop documentation is structured for these early ATV models. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions.

An official 100-page Yamaha OEM workshop manual covering the 1986–1988 Yamaha YFM225 Moto 4, documenting engine, chassis, electrical, and fuel-delivery specifications for this iconic four-wheeler.