07-11-2007, 05:10 AM
I rebuilt my '92 Evinrude 90 this year and ran it at approximately a 25/1 ratio for the first couple of tanks to make sure that I got the pistons nice and lubricated during break in. I noticed a similar phenomenon. At open throttle, I was running hot enough to burn out the extra gas/oil; but just off idle, I was fouling my plugs because I wasn't getting a clean (complete) burn of all gas/oil - apparently from not getting enough air in the cylinder. Trimming the motor up slightly seemed to help drain the excess gas/oil out of the cylinder so that it wouldn't foul. Now I've just made a habit of also trimming up the motor when I'm up front using the electric as well. It keeps the cylinders clean and I don't have to worry about banging up my prop/motor.
One other little trick I've started doing is leaving a sparkplug wrench and rag in the boat so I can pull the plugs and check to see if they are wet. If they are, just dry them off and it would fire right back up. I haven't had an issue with it since the first couple of tanks (went back to closer to 50/1) but it saved me a couple of times.
I don't know if this will help, but it can't hurt.
[signature]
One other little trick I've started doing is leaving a sparkplug wrench and rag in the boat so I can pull the plugs and check to see if they are wet. If they are, just dry them off and it would fire right back up. I haven't had an issue with it since the first couple of tanks (went back to closer to 50/1) but it saved me a couple of times.
I don't know if this will help, but it can't hurt.
[signature]