problem with evinrude 6 horse fouling plugs

[pruble]

I am having a problem with my evinrude, it is either a "69" or a "73" not sure, I have been using the 50:1 mix and it keeps fouling spark plugs. I have tried cleaning it and nothing seems to work. Anybody seem to have any ideas as to what to do?

 

[ezeke]

Re: problem with evinrude 6 horse fouling plugs

Check your compression. Are the plugs about the same in appearance when fouled? What plugs are you using?<br /><br />You might want to read item "b" in the engine FAQ on this site. web page The spark plugs are easy to see, but the rest of the cylinder is not. Count on it being fouled as well which is why you need the de-carb.<br /><br />If you haven't already done so you might also want to put in a new thermostat. That will get the motor running hotter which will burn off more of the oil and keep it cleaner. You can also get it hotter by increasing the gap on the spark plug. <br /><br />If the compression is relatively low you could see improvement by using a high quality 100% synthetic TCW-3 rated oil. Just try it and see if you find a difference.

 

[pruble]

Re: problem with evinrude 6 horse fouling plugs

the plugs are champions j6c. they both are fouled the same way.i am not sure which way the lean rich screw goes.my motor has no way of letting me know which way is lean or rich.so i don't know if the screw needs to go to the left to lean it out.

 

[pruble]

Re: problem with evinrude 6 horse fouling plugs

how do i check the compression

 

[ezeke]

Re: problem with evinrude 6 horse fouling plugs

When the motor is running and warmed up, slowly choke the motor. If the speed increases, you are already running too lean. To enrich the mixture, turn the knob counterclockwise in 1/8 increments giving at least a minute for each change to take affect.<br /><br />Fouling usually indicates the opposite, though, and you would want to go clockwise in the same increments until you feel the motor begin to shudder a bit. Then back out 1/8 counterclockwise and leave it alone.

 

[ezeke]

Re: problem with evinrude 6 horse fouling plugs

Check the compression with a screw in gauge. You can usually find a kit at an auto supply. Take the spark plug so you can make sure you get the right fitting. You can buy a kit that has multiple fittings and hoses. Almost all small engine repair mechanics have them and you may be able to just rent or borrow one. <br /><br />Take out both plugs.<br /><br />The most important thing is to be consistent in your method so that you have a basis for comparison later. I like the motor warm and well lubricated, so I let it run awhile before I test.<br /><br />If your motor is a rope start, you will want to seat your gauge well so it can't leak. Then pull full sharp strokes until you feel that you have taken the reading as high as possible. Switch cylinders and repeat. Record the results in your manual for future reference.

 

[pruble]

Re: problem with evinrude 6 horse fouling plugs

i have one more problem.the throttle will noy stay at one speed.i adjust the speed to go faster and the throttle always falls back to an idle.i am not sure what i can do to keep the throttle at on speed.here is another thing i just remebered.should i mix the gas at 50-1 4oz oil to a gallon on gas or 3oz?

 

[Walker]

Re: problem with evinrude 6 horse fouling plugs

2.5 oz/gal

 

[ezeke]

Re: problem with evinrude 6 horse fouling plugs

128 oz. per US gallon/ 50 = 2.56 oz/ gallon.<br /><br />3 Gallon tank needs about a cup (8 oz).<br /><br />6 gallon tank needs about a pint (16 oz) of oil. <br /><br />2.56oz X 6 = 15.36oz.