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Evinrude 25 pk 2 stroke 2cyl outbord boatmotor

Hi ,

i have the problem that my 2 cylinders evinrude boatengine is only working on 1 cyl after approx 10 to 15 min on sea.

When i release the trottle then (sometimes) the second cylinder is catching up again and keep on working when i stay below a certain rpm.

I have changed the 2 spark plugs and then it works again on 2 cylinders, but again after approx 10-15 minutes the 2nd cylinder is again giving up... i think it is a combined problem, unless i use the wrong sparkplugs. I have now the Champion L85 short spark plugs. Starting the engine (manual) is no problem, even when working on 1 cylinder.

I have technical education and can do a lot myself, i only need suggestions.

I have tested the spark plugs when not fitted into the engine to check the spark and i have the impression that the little spark of one cylinder is white and i think it should be blue.

Thanks anyway for some advice.

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  • Anonymous Mar 14, 2014

    new starter,solenoid,coils,powerpack,plugs snd plug wires. using fresh gas out of portable gas tank. motor turns over good and grtting both fuel and spark to cylinder but wii\ll not start.any ideas on this would be a great help


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Hello enjoy42. From the information you have provided I would lean to the weak cylinder coil. Unplug the good spark plug wire & test run the engine on the weak cylinder. You could go to swapping the coils on the cylinders. Check your wiring terminals on the coils. Check with a marine dealer for the correct plug. I owned a 35 Evinrude on a Bass boat & it would out run my buddys 40 Mercury. Good Fishing.

Posted on Oct 03, 2008

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