Spark plugs fouling

[fishn_n_tx]

I have a 1976 evinrude 40 hp. Here lately it has been fouling plugs. Looks to be fuel fouled, and wet. Not carbon fouling.<br /><br /> Been doing alot of idling around watching the fish finder. I believe the plugs I am running are L77JC8.<br /><br /> Is there a hotter plug I can run or one better suited for idling around? <br /><br /> should I adjust the carb, maybe turn the screw in 1/2 turn?<br /><br /> I bought some castrol 2 stroke oil, going to give that a try. Was running the cheap no-name brand of oil. Also might try the Sea Foam and see if that might help.<br /><br />Also, If I'm out and a plug fouls, does it hurt to idle in on the one cylinder? There is only one carb so both cylinders should be oiling, is that correct?<br /><br /> Kinda frustrating, ran all duck season on the same plugs, now fishing I carry a whole box of plugs and might run through 2 sets in a day.<br /><br /> Thanks for the help, Gary

 

[marinemech1]

Re: Spark plugs fouling

cheap oil hmmmm? theres no such thing it either cost money for oil or cost money somewhere else.<br />put in good quality tcw3 oil see if problem goes away

 

[dolluper]

Re: Spark plugs fouling

try a champion UL81C manfacter rec's gap of 30 but for trolling gap at 40

 

[willamettejeff]

Re: Spark plugs fouling

You may need a new thermostat. Check to see if your motor is getting up to operating temperature. Otherwise and plugs will not get hot enough to burn off residue from inefficient combustion.