evinrude 67 5hp fuel trouble?

[mlryan]

i have a 67 5 hp evinrude that i just did a complete overhaul on, when i say complete i man i remover almost every screw nut an bolt, drilled and tapped all holes, new gaskets, water pump, fuel lines, the works. The motor had the problem before the overhaul and continues to have the problem. I will choke the motor (mauel choke) pump the primer bulb once move the throttle to wide open and pull the cord and it starts right up and revs high without loosing power. I turn the throttle to about half and let it run for about 1 min to get engine up to temp and turn off the choke. The engine at full throttle revs up really high and then slowly looses power until it cuts off and at lower throttles it shakes violently before die'n on me. I need help getting the ghost out of this engine. I am goin to replace all the parts in the fuel pump, and i am gonna put in new reeds. Anybody out there had similar problem?<br /><br />Help me cause i thinkin about using the motor as an anchor

 

[Joe Reeves]

Re: evinrude 67 5hp fuel trouble?

First of all, never start the engine at full throttle.... half throttle is sufficent.<br /><br />Setting the point gap... have the crankshaft/flywheel key aligned with the fiber rubbing portion of one set of the the points, then set the points to .020, then repeat the procedure with the other set of points.<br /><br />It sounds like you have a fouled carburetor. Remove, clean, and rebuild it. Be sure to manually clean the high speed jet located in the bottom center portion of the float chamber.<br /><br />(Carburetor Adjustment - Single S/S Adjustable Needle Valve)<br />(J. Reeves)<br /><br />Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.<br /> <br />Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S 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.<br /> <br />Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). 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 />Note: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.<br /><br />When you have finished the above adjustment, 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.