Re: 1961 40hp EVINRUDE CARB HELP
STAGE3,<br /><br />Do you have a service manual for that motor? If you are troubleshooting or working on your own motor, they are a 'must have'.<br /><br />You may wish to do a few quick checks, and go back to square one with some adjustments.<br /><br />With the engine off, when you squeeze the fuel primer does it go firm or does it spit gasoline out through the throat of the carb? If it spits out at you, your float needle/seat are not seating well. They may be worn, or sticking.<br /><br />The low speed idle adjustment is very important to ensure the motor will idle well. Typically that is screwed in all the way GENTLY, and then backed out 7/8 turn or so to provide a smooth idle. Adjust lean/rich as required.<br /><br />Ideally you want to have about 650 rpm at idle, with the boat in gear. Adjust for smoothest performance, while keeping it as slow as possible to avoid undue stress on the gears.<br /><br />Did you adjust the point gap (typically .020), while you had the flywheel off? It directly affects ignition timing.<br /><br />A wide variation causes imbalance on the crank load, and inefficient operation. Could be from bad reeds, worn cylinders, stuck or damaged rings etc. If compression is way out of whack or ecessively low, it may be time to have a peek inside. In the meantime, you can try to decarb the engine with a marine formulated decarb (seafoam or equivalent) fluid to see if that helps.<br /><br />I'm still an 'outboard newbie', so I hope the experts will point out any errors I may have made with my advice.<br /><br />Good luck, and keep us posted.
