1990 Evinrude 70 smoke

[bokarlsten]

My Evinrude 70 smokes a lot at idle and low RPM<br />VRO is disconnected.I have mounted a new headgasket and thermostat. At higher RPM it works fine. It works fine also at idle but it´s irritating with all that smoke. Fuel/Oil ratio is 50:1. The engine has been stored for a couple of years, maybe that can harm the carbs, Also when pressing the bulb on the fuelline it never gets firm. (Pls bare with my spelling I´m from a´broad.)<br />Any suggestions??

 

[JB]

Re: 1990 Evinrude 70 smoke

Howdy, SS.<br /><br />It is normal for 2 strokes to smoke. It seems like a lot more at idle because the smoke sufaces right behind the boat. At higher speeds the smoke surfaces quite a way behind, and is spread out.<br /><br />If your primer bulb does not get firm, you may have one or more carbs with leaky float needles causing one cylinder to run too rich. That would cause extra smoke. <br /><br />An inspection of the spark plugs would help determine the health of your engine. Slight tan deposits and slightly moist is a normal plug. Black and sooty or lots of carbon and wet with fuel is a sign that cylinder is too rich.<br /><br />Let us know what you find.

 

[bokarlsten]

Re: 1990 Evinrude 70 smoke

Thanks for your reply!<br />The plugs are new and looks fairly ok. a bit oily moist on them, maybe a bit too much.I believe it could be a good idea to change floatneedles and see if makes a difference. Would that be a major job??

 

[JB]

Re: 1990 Evinrude 70 smoke

Not hard at all, SS, if you have a manual. If you don't it would be a very good idea to get one or borrow one from a library.<br /><br />Good luck.

 

[bokarlsten]

Re: 1990 Evinrude 70 smoke

Thank´s JB I will borrow one and try that. If it doesn´t work I will come back to you for more advise.<br />brgds SS