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1990 evinrude 8 hp miss or surging @ wot

J

jersey bob

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Put 2 hrs on the engine today, about half @ full throttle. Engine is a 1990 E8RESR, idled great, no stalling or hesitation going to full speed. As this engine had been stored since 2003, I figured on a few issues. 1st startup ran it in a garbage can with a fuel line in a gallon jug, seemed to run good enough to buy it. Getting it home it seemed to run ok @ low and medium rpms, any faster and it would slow down and eventually quit, as if it was running out of fuel. Pulling the choke would not keep it running ( @ this point it was hooked to a standard 6 gallon tank and line ). Got repair kits for the fuel pump & carburetor, redid both ( did not see anything amiss with the carb ). The fuel pump ( thank god for the instructions included) pretty much the same. New w/p kit and we were good to go today. What I'm not sure about is, does this engine have a rev limiter on it? Does it have electronic ignition? It doesn't seem like a fuel problem, more like stumbling, when you back off the throttle it clears up. Few items: filter screen @ pump cleaned, float level checked ok, new correct plugs installed ( pulled after today's run look good, no fouling) , ran with cap loosened on tank in case vent wasn't clear. That's about all I can think of. I know it's hard to diagnose over the computer, but appreciate any help. If anyone read my post abt the rewind spring for this motor my entire fishing career was powered by DD 6-71s & 8-92s none of that is helping me now. Thanks for reading, Jersey Bob
 
No limiter. I think this motor has a stator plate mounted power pack. This means when the throttle position moves, the wires from it also move. Check those wires for continuity and look for any abrasion on them. Loss of power supply to one or even both coils may create your symptoms at different throttle positions.
 
timguy said:
No limiter. I think this motor has a stator plate mounted power pack. This means when the throttle position moves, the wires from it also move. Check those wires for continuity and look for any abrasion on them. Loss of power supply to one or even both coils may create your symptoms at different throttle positions.
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I will do so, because I;m computer illiterate I may have deleted a response that asked did I check the following: completly clean the carb, check the main high speed orifice, correct plugs and gap, Yes to all the above. I have no idea what rpms this issue starts as I don't have a hand held tach. Installed propeller is one of the standard evinrude props 8.5"D X 9"P. I guess I'm running out of things that I, myself will be able to check. I do realize that the boat has to be underway to check out, you can't do much running it in a garbage can. Thanks, Jersey Bob
 
Bob, you can also check for spark interruption by removing the spark plugs and pulling it over by defeating the lock mechanism in all throttle positions. No need to use a spark gap tester for this.....just use the spark plugs. Why? If there is continuity problem with a wire from pack to spark coils.....the spark will be lost to affected cylinder enough to show the loss at the spark plug gapped at .030.
 
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