2 questions

[brian91z28]

1. How warm should the cylinder head be on a 1994 Evinrude 70hp at idle, 10 min of running? Should it be hot, or just warm to the touch? I ask because I cleaned the carbs, and tuned.

2. Will I be able to recognize a slightly lean running condition by checking the spark plugs colors after 10 minutes of run time both idling, midrange, and wot?

Any help would be much appreciated

 

[rickdb1boat]

Re: 2 questions

You should be able to hold your finger to the cylinder for a few seconds before you have to remove it. So yes, it will be "hot". You may be able to verify a lean condition on one of the plugs after running it at WOT and then shutting down and checking the condition..

 

[brian91z28]

Re: 2 questions

Thank you, I had an infared thermometer, and it was reading 149 degrees while at idle, and when at midrange it read 122. Spark plugs were brown, and slightly saturated, I just didnt know if a lean condition would show itself that quickly

 

[rickdb1boat]

Re: 2 questions

It sounds from your readings that it is running about right. What makes you believe it is running lean on one or more cylinders?

 

[tashasdaddy]

Re: 2 questions

are you getting a cough or sneeze at idle?

 

[brian91z28]

Re: 2 questions

I did cough a little before I cleaned the carbs. I didnt have and precursors for a lean condition, just investigating, and trying to be proactive. Thank you guys for all the help. This sight is awsome!!!