Re: evinrude missing at idle only
problem can consist of two different things, ignition or gas/air mixture. First pull plug wires one at a time. Insert a big nail in boot, hold it 5/16" from block while someone else pulls rope start. Both sparks should jump gap with strong blue spark, equally. If they do, rule ignition out. If one has weak spark, probably a bad condenser. If spark OK, check that the little gasket around low speed jet is good and retainer nut tight ( not too much ). When thats OK, do a carb low speed adjustment. following Joe Reeves excellent advise, when motor is warmed up, and pulling boat forward, unrestricted in gear:<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 valve 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, waiting 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.<br /><br />If that wont help. disassemble carb, remove all plastic and rubber parts, soak overnight in carb cleaner, install a rebuild kit, and start from there.
