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

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

• Complete technical reference for the 1991–1995 Yamaha Moto-4 YFM350ERA, including variants starting with VIN JY43HPW0*LC024101
• 330-page official Yamaha OEM publication (1991 edition)
• Features 47 exploded-view mechanical diagrams and 52 indexed specification tables
• Delivered as an instant download directly to your device the second checkout is complete
• Fully searchable, indexed PDF format—perfect for printing specific sections for shop-floor use
• Permanently stored in your account for easy retrieval if you lose your local files
• The definitive baseline architecture guide for the Moto-4 350-series powertrain and chassis

Manual Content Summary

Getting right to work on the 350-series ATV requires accurate factory data. This guide maps out the complete teardown and assembly parameters without any guesswork. You get clear, indexed breakdowns of engine top-end and bottom-end overhauls, alongside precise fuel system calibration metrics. It also covers the drivetrain extensively, delivering the exact middle and final gear adjustment numbers you need. Since this file is an instant download, you can pull up these critical specs on a tablet right at your workbench immediately after purchase.

Chassis and electrical work becomes straightforward when you have the right numbers. The documentation provides comprehensive wiring diagrams and component testing thresholds for the CDI ignition, charging system, and lighting circuits. It pinpoints performance issues quickly using structured troubleshooting flowcharts. Whether you are dealing with a dead stator, starting failure, or handling instability, the diagnostic trees map out the exact testing sequence.

Specification Highlights

Precision matters in the shop. The reference tables list critical figures like an intake valve clearance of 0.06–0.10 mm and a strict piston-to-cylinder clearance limit of 0.1 mm. You will also find that the charging system needs to output 12 V at the alternator terminal, and standard cylinder head bolts require a 40 Nm torque sequence. Working on these heavy powertrain systems carries inherent physical risks, so always ensure proper shop safety protocols are followed and verify heavy assembly steps with a certified technician if you are outside your comfort zone. To keep every fastener locked strictly to OEM standards, reference the comprehensive breakdown of factory torque specifications included for all major engine and chassis assemblies.