Re: We're stumped -79 Evinrude 2 hp
Compression is of major importance with that single cylinder engine. Should it be lacking somewhat, I'd suggest that you remove the cylinder head and using wet/dry 400A sandpaper, carefully hone the cylinder in a cross patch pattern (as good as possible), and just as carefully remove the resulting grit etc.<br /><br />Of course, the proper method to do the above would be to dismantle the engine completely but it can be done as explained.<br /><br />Use Champion J6C plugs, gapped at .030 if not already doing so. Points set to .020 when flywheel key is aligned with the fiber rubbing portion of the ignition points.<br /><br />With the s/plug removed, the spark should jump a 1/4" gap on that model with a strong blue lightning like flame.... a real SNAP! If not, find out why and correct that problem.... coil, condenser, points, plug wire?<br /><br />The carburetor must be absolutely clean and percisely adjusted. If there's the slightest doubt as to the carburetors cleanliness and/or quality of its gaskets, rework the carb.<br />(Carburetor Adjustments - Two Adjustable N/Vs) <br />(J. Reeves)<br /><br />Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slow speed = seat gently, then open 1-1/2 turns. <br /><br />Setting the high and low needle valves properly:<br /><br />NOTE: For engines that DO NOT have a shift selection, obviously there is no NEUTRAL position. Simply lower the rpms to the lowest setting to obtain the low speed needle va /lve adjustment.<br /><br />(High Speed) Start engine (it will run pretty rough), shift into forward gear, take up to full throttle. In segments of 1/8 turn, wating for the engine to respond between turns, start turning in the bottom high speed needle valve. You'll reach a point whereas the engine will either start to die out or spit back (sounds like a mild backfire). At that point, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest setting. <br /><br />(Low Speed) Slow the engine down to where it just stays running. Shift into neutral. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting. <br /><br />When you have finished the above adjustments, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
