1991-1995 Yamaha Moto-4 YFM350ERA / YFM-350 ATV Service Manual

1991–1995 Yamaha Moto-4 YFM350ERA — Technical Scope and Data

• Covers the 1991–1995 Yamaha Moto-4 YFM350ERA, including sub-models and variants identified by serial numbers starting with JY43HPW0*LC024101
• Official Yamaha OEM publication, P/N unknown, dated 1991
• Contains 47 detailed exploded-view mechanical diagrams and 52 indexed technical specification tables
• Delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Suitable for printing individual sections for shop-floor use
• Stored against your account so you can retrieve it after a hard-drive loss
• Permanent availability in your purchase account — no re-buy required
• This 1991 edition serves as the foundational reference for the entire Moto-4 350-series powertrain and chassis architecture

Manual Content Summary

This 1991–1995 Yamaha Moto-4 YFM350ERA service manual provides complete technical documentation for the maintenance and overhaul of the 350-series ATV. The documentation structure follows a logical progression, starting with machine identification and special tool references. Chapters define the mechanical requirements for periodic maintenance, engine top-end and bottom-end overhaul, and fuel system calibration. Further sections detail drive train service, specifically addressing middle gear and final gear adjustments, alongside comprehensive chassis maintenance for steering, suspension, and braking systems.

Electrical systems are fully documented, containing circuit diagrams and component testing thresholds for the CDI ignition, charging system, and lighting circuits. The diagnostic section categorizes performance issues ranging from starting failure to shifting difficulties and handling instability. Troubleshooting flowcharts and component reference values aid in system identification, ensuring the 1991–1995 Yamaha Moto-4 YFM350ERA is maintained to factory standards throughout its lifecycle.

Specification Highlights

Engine maintenance parameters are documented with extensive clarity. Intake valve clearance is specified at 0.06–0.10 mm in the engine specification tables. The 1991–1995 Yamaha Moto-4 YFM350ERA charging system produces 12 V at the alternator output terminal. Piston-to-cylinder clearance limit is established at 0.1 mm in the cylinder wear analysis data. Specific torque values for critical fasteners, such as the cylinder head bolts, are listed at 40 Nm. The manual includes a comprehensive breakdown of factory torque specifications for all major engine and chassis assemblies. Reference only — always consult a certified technician before performing service on this equipment. This 330-page official Yamaha factory publication documents the full service and maintenance requirements for the 1991–1995 Yamaha Moto-4 YFM350ERA ATV, providing complete data for engine, drivetrain, chassis, and electrical system diagnostics.