1987-1995 Yamaha YFM350ER Moto 4 ATV Service Manual

Yamaha YFM350ER and YFM350ERT Moto 4 Coverage

• Covers 1987–1995 Yamaha YFM350ER and YFM350ERT Moto 4 ATV models, including engine, chassis, and electrical system diagnostics for the YFM350 series
• Original OEM publication P/N LIT-11616-07-01, first edition dated April 1986
• Contains 80+ exploded-view component diagrams, internal tolerance charts, valve clearance adjustment tables, and electrical system schematics for precise unit identification
• Accessible from your device as soon as the order is placed
• Suitable for printing individual sections for shop-floor use
• This 1st edition is the reference used for the original Moto 4 launch build, documenting specific YFM350 series frame and engine serial number prefixes

Manual Structural Overview

This factory-authorized documentation organizes the maintenance and mechanical procedures for the Yamaha Moto 4 series. The technical chapters provide a systematic review of engine overhaul requirements, chassis component management, and periodic inspection routines. Each section relies on a structured sequence, detailing component removal, inspection standards, and reassembly protocols, supported by exploded-view illustrations that identify every fastener and gasket requirement for the YFM350ER.

Additional segments address critical systems including carburetion, cooling, and electrical circuitry. The how factory workshop documentation is structured page offers insight into the organization of these chapters, which cover everything from valve clearance adjustments to final drive gear lash measurement and crankcase splitting. Specialized inspection data for transmission gears, clutch housings, and steering shaft bushings ensures technicians possess the necessary reference values for deep maintenance tasks.

Specification and Data Preview

Technical specifications are documented throughout the text, providing wear limits and clearance tolerances for the 350 cc power plant. Intake valve clearance for the Yamaha YFM350ER is listed at 0.06–0.10 mm in the cylinder head specification table. The crankshaft runout limit is specified at 0.06 mm in the engine assembly data. Final gear oil capacity for the Moto 4 is documented at 0.13 liters. Reference values for spark plug gaps, battery charging currents, and tire inflation pressures assist in routine service work. Cylinder head bolt torque values are documented in a multi-stage sequence, ensuring proper sealing during engine assembly. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions.

An official Yamaha OEM workshop manual covering the 1987–1995 YFM350ER and YFM350ERT, documenting engine, chassis, electrical, and drive-system specifications for the YFM350-series build.