1995 Johnson Evinrude "EO" 60 LV 90, 115, 150, 150C, 175 Service Manual, P/N 503151, Page 109Get this manual
The power pack has several basic functionsIt stores and distributes the voltage received from the charge coil(s)The 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 excessivelyThe 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.OWwarning 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 QuikStartTM electronic starting, which automatically advances the ignition timing when the engine temperature is less than 1050 (41 C), and for approximately seconds each time the engine is started, to ensure reliable startsKey Switch[The key switch and emergency stop switch are connected to the power pack through the engine wiring harnessWhen the key switch is turned off or the stop switch is activated, these switches direct the power pack output to ground, stopping the ignition system rn