Smoking

[cmikee]

I have a 1970 115 HP Mercury OB 2cycle model 1150. I noticed that it smokes white smoke. Is this normal for a 2cycle motor? Thanks for the information.





P.S. Thanks for all your help on the leak it was the return line leaking.

[Talon2.5]

yep it's normal for a 2 cycle ;)


cant believe 26 people read this and didnt reply :rolleyes:

[Rusrog]

It's normal. How are you mixing you oil to gas? If you mix it too heavy.... 20:1 or 32:1 you will get considerable smoke but you will be protecting the engine better. But in general.....all 2 strokes smoke to some degree....

[mercrazy]

be sure it's smoke and not steam.
make sure your water pump is working properly.
most smoke is blue after the engine warms up.

[cmikee]

Thanks for the info. The smoke will mostly show up at idle. When running at higher RPM the smoke will disappear (or at least seems like it). I am using 50:1 ratio. When it is warm it will still smoke white smoke at idle.

[mercrazy]

if you don't have a water pressure gauge, make sure your overheat sensor is working. if you haven't changed your impeller in the last couple of years, i would change it now.

[Jeff_G]

What overheat sensor? :D

[jo6pak]

steam will evaporate, 2 cycle smoke will be blue late in the day when you are out of direct sunlight. in the middle of the day 2 cycle smoke appears white. at cruising speed smoke goes under water because it blows out of the lower unit.

[cmikee]

Thank You very much for the information. I feel better about the smoke.