1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 286Get this manual
Throttle Friction Adjustment This feature controls the return friction on the control handleClockwise rotation will increase throttle friction and counterclockwise rotation will decrease throttle frictionThe adjustment should be just tight enough to prevent unwanted throttle "creep" under normal operating conditions Key Switch and Primer
This feature controls the engine accessories, starting, priming, and stoppingTurning the key clockwise to the first detent turns on all engine-controlled accessoriesContinuing to the second detent will energize the engine's electric starterPushing the key in at the first or second detent will energize the fuel primer solenoidTurning the key fully counterclockwise will turn off the ignition system and all engine-controlled accessories
Fast Idle Lever
This feature controls engine speed when the control handle is in NEUTRALThe lever should be raised high enough to ensure consistent idle speed and cold run-on while starting the engineThe lever must be returned to the RUN position before selecting FORWARD or REVERSEAccessory Connector This feature allows convenient access to the engine accessory and tachometer circuitsSeveral OMC tachometers and wiring kits provide mating connector to simplify accessory installationMaximum draw on this circuit must be limited to amps