1990 Yamaha MOTO-4 250 Service and Repair Manual

A 1990 MOTO-4 250 wears the model code YFM250A, and Yamaha's service manual for it is LIT-11616-YF-25, shared with the 1989 and 1991 machines and with the MOTO-4.

Chapters follow the machine rather than the calendar: general information and maintenance, engine, chassis, electrical. Within each one the pattern holds steady, removal then inspection against a stated limit then assembly at a stated torque, which is what makes the factory text worth having over a generic guide.

Fluid capacities and the fastener torque table sit in the opening chapter, with exploded views through the repair sections. The electrical chapter is often the reason an owner buys this book. It includes the full wiring diagram, the connector layout and the circuit-by-circuit checks for charging, ignition and lighting faults. Verify YFM250A before you begin.