Spark plug?

[minnoak]

I just purchase a boat with a 88hp 95 Evinrude. Very strong motor,, but on thing I noticed was that 3 of the 4 spark plugs was wet and the one on the starboard top was white and dry. Should this plug be a little wet too? Is it a matter of adjusting the mixture at the carb for that cylinder? Plugs not fouling. Are the plugs suppose to be wet? Thanks<br /><br />P.S. Compression 120 across the board. Lower unit good!!!

 

[Joe Reeves]

Re: Spark plug?

MinnOak.... Compression sounds okay. Remove the spark plugs and check the spark. It should jump a 7/16" gap with a strong blue flame. What plugs are you using, and at what gap? Let us know what you find.

 

[minnoak]

Re: Spark plug?

There is a little change to my last message. The spark plug that is white and dry is on the top port side. Does this make a difference for diagnosis? I will still check the gap, the spark, and the plugs. Can you tell what I'm looking for, i.e if I have spark what next? If the spark is strong what next? Is the spark plug suppose to be damp with fuel and oil?

 

[Joe Reeves]

Re: Spark plug?

If you have spark of the quality as I've explained it, and the compression is okay, then I would suspect a fouled carburetor.

 

[minnoak]

Re: Spark plug?

Would some good ol' OMC engine tune do the trick?

 

[DJ]

Re: Spark plug?

minnoak,<br /><br />Probably not. It may be time to go into the carbs.<br /><br />I would do it before you melt down that cylinder. It's not that hard, with a manual.

 

[minnoak]

Re: Spark plug?

Rebuild of the carbs or to what extent? Should I have the other set done also?

 

[minnoak]

Re: Spark plug?

Would the engine run as strong as it does with a fouled carb? This thing idles great has very good power and runs about 45mph with no miss. Don't doubt your expertise at all, just asking.

 

[minnoak]

Re: Spark plug?

Hey guys,<br />Got the info on the plugs. They are Champion QL77JC4, strong spark, gaped at .036 all of them. Rebuild carb for that cylinder?

 

[willxuout]

Re: Spark plug?

rebuild all the carbs. do one, do them all.