1993 Johnson Evinrude "ET" 60 thru 70 Service Manual, P/N 508284, Page 108Get this manual
Power Pack
f41 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 winding
The power pack has an RPM limiting circuit which helps protect against powerhead damage due to overrevingOverreving can resu It 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.O.WTM warning 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 10 seconds each time the engine is started, to ensure reliable starts