1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 113Get this manual
Power Pack
The power pack has several basic functionsIt stores and distributes the voltage received from the charge coilsThe power pack uses electronic switches, activated by the timing sensor, to select the correct ignition coil primary windingThe power pack has an RPM limiting circuit which helps protect against powerhead damage due to overrevingOverreving can result from: Installing the motor too high Carrying less weight than the motor is propped for Using propeller that is too small, has very worn blades, or ventilates excessively
The power pack incorporates the S.L.OWwarning system, which gradually limits engine speed to approximately 2500 RPM if the engine temperature switch closesOnce the S.L.DWwarning system has activated, the engine must cool to allow the temperature switch to openThe engine must be shut off before normal operation can be resumedThe power pack incorporates OuikStartelectronic starting, which automatically advances the ignition timing when the engine temperature is less than 1050 (41 C), and for approximately 10 seconds each time the engine is started, to ensure reliable startsStop Button