Bowhunter1661
Well-known member
I just bought a new to me 88 johnson 25. I took it to Lake Michigan today for her maiden voyage. The motor runs fantastic. 125 psi compression in both cylinders. Takes of like a monster on my 1440 Lowe, and tops out (in VERY high waves at 28 mph). The thing is, after running a few miles and coming to an idle the motor smokes pretty bad. At first it appeared to be steam, but when I got to a non windy area I could see the smoke in the sunlight and it was blue. Last owner replaced he impeller last year. Spots water out of midsection in rear and pisses water good out of the tell tale.
Water from tell tale is pretty warm, but I can keep my hand in the flow. Head is hot after run but once idling the pump seems to cool it down. Also, after idling a while the tell tale water becomes cool.
When I got home I pulled both plugs. Both plugs and cylinders had what appeared to be oil and fuel in them. I stuck a paper towel in one and it smelled and appeared to be only fuel and oil.
So here is my question, am I just running my fuel oil too rich? I have it mixed for 50:1. Or could it be an over fueling issue at idle? I was playing with the idle air fuel knob and set it to 1.5 turns out from lightly seated. Or is it over heating? My 15 up evinrude would pee cool water all the time from the tell tale. I just don't want to burn up my motor!
Water from tell tale is pretty warm, but I can keep my hand in the flow. Head is hot after run but once idling the pump seems to cool it down. Also, after idling a while the tell tale water becomes cool.
When I got home I pulled both plugs. Both plugs and cylinders had what appeared to be oil and fuel in them. I stuck a paper towel in one and it smelled and appeared to be only fuel and oil.
So here is my question, am I just running my fuel oil too rich? I have it mixed for 50:1. Or could it be an over fueling issue at idle? I was playing with the idle air fuel knob and set it to 1.5 turns out from lightly seated. Or is it over heating? My 15 up evinrude would pee cool water all the time from the tell tale. I just don't want to burn up my motor!