Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 316Get this manual
IGNITION CONTROL SYSTEM
Measuring steps (1) Place the engine cooling water temperature sensor in container filled with water(2) Place thermometer in the water(3) Slowly heat the water(4) Measure the resistance when the specified temperature is reached8320
INSPECTING THE THERMO SWITCH CONTINUITY 8