1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 121Get this manual
RPM Limiting Power Pack This power pack has built-in RPM limiting deviceCertain models are equipped with RPM limiting power pack to guard against possible powerhead failures caused by improper propeller selection (underpropping), excessive wear on propeller blades, improper motor installation, propeller ventilation, or unusually light boat loadingBe sure to use the correct power pack when servicing the models listed below to control the engine's operating RPM range and protect it from powerhead damage due to overspeedingModel RPM Limit
40, 50 Recreational 25DR, 40R, 48 40RS, 45, 55
6700 6100 5800
General InformationCD II Ignition
Troubleshooting the Ignition System