Just bought a 1977 85 HP Evinrude as part of a package deal.<br /><br />Before trying to run it I bought a new gas tank, new gas line and primer bulb. New gas and fresh mix.<br /><br />First try on the lake it started up OK, and seemed to run fine, although with a bit of vibration.<br /><br />After running for about 15 minutes, the power began to surge, the vibration stopped and we were going faster ( for only a few seconds at a time).<br /><br />Back at the dock, #3 cyliner seemed to be cooler to the touch than the others. Pulling the plug wire from #3 cylinder had zero effect on the motor.<br /><br />Swapped the plug from #1 to #3 and no change. The #1 cylinder worked great on the plug from #3.<br /><br />Pulling the #3 plug and running the motor I could not see any spark at the plug with it grounded out to the block.<br /><br />Please, give me some troubleshooting tips. <br /><br />Thanks,<br />Carl<br />Cheney, WA<br /><br />PS: I hope I can get this motor fixed, because with only 3 jugs hitting, my 27 foot pontoon barge is kinda pokey!