1997 Johnson/Evinrude EU 25, 35 HP 3-Cylinder outboards Service Manual, Page 109Get this manual
S.1.OWarning System This ignition system incorporates the S.L.DW warning system, which gradually limits engine speed to approximately 2500 RPM when one of the following conditions occur: Engine temperature exceeds 240 (1160 Cl Oil level in the oil tank drops below predetermined levelThe S.L.OWwarning system depends on input from: The temperature switch tanblue lead for an engine overheat The no oil sender tanyellow lead for no oil in the oil tankTo resume normal operation after the S.L.O.Wwarning system has activated, the engine must be operated below 1500 RPM and: Engine temperature must cool to 20r (9r Cl, for an engine overheat Outboard lubricant must be added to the oil tankTemperature Switch 1Disconnect temperature switch tanblue lead2Install correct test propellerStart engine in test tank and run at 3500 RPM