Re: Shift control adjustment & timing set for 75hp Evinrude
BowHunter2..... Have the control box in neutral. At the engine with the shift cable detached, have the engine shift lever in neutral. Notice that there is a slight amount of play in the lever, center it.<br /><br />Now, hold and push/pull the shift sleeve that is the end of the shift cable, notice the play there and center it. Adjust the trunion on the threaded portion of the shift cable so that the hole in the shift sleeve lines up with the engine shift lever threaded stud. Install the shift cable at that position.<br /><br />Timing?? That should need any adjustment unless you've moved it. However, it can be adjusted as follows:<br /><br />(Timing At Cranking Speed 4°)<br /><br />The full spark advance can be adjusted without have the engine running at near full throttle as follows. <br /><br />To set the timing on that engine, have the s/plugs out, and have the throttle at full, set that timer base under the flywheel tight against the rubber stop on the end of the full spark timer advance stop screw (wire it against that stop if necessary). <br /><br />Rig a spark tester and have the spark gap set to 7/16". Hook up the timing light to the #1 plug wire. Crank the engine over and set the spark advance to 4° less than what the engine calls for. <br /><br />I don't know full spark advance setting your engine calls for, but to pick a figure, say your engine calls for 28°, set the timing at 24°. The reasoning for the 4° difference is that when the engine is actually running, due to the nature of the solid state ignition componets, the engine gains the extra 4°. <br /><br />If you set the engine to its true setting at cranking speed, when running it will advance beyond its limit by 4° which will set up pre-ignition causing guaranteed piston damage! You don't want that to take place. <br /><br />No need to be concerned about the idle timing as that will take care of itself. The main concern is the full advance setting. <br /><br />Be sure to use your own engines spark advance settings, not the one I picked out of the air here in my notes.
