excessive oil in exhaust? 40 hp 2 str. Merc.

1996 C40ED Merc 40 hp 2 stroke. everything seems to work fine, but after doing lots of trolling I get what seems an excessive amount of milky-white gas/oil globules from the exhaust and from vents on each side of the lower unit just above the cavitation plate. attached video shows condition, however at times it can be worse than shown--thumbnail size globules coming out. normal blow-by or a problem? http://youtu.be/7uSI3NHLlv0

Thanks for the responses. I think I'll pick up a 4 stroke 4 hp for trolling--better for the lake and I'll save on gas too!

if you do a lot of trolling you could get a spare prop and drop down in pitch this would require higher rpms to maintain trolling speed. of course it would change your holeshot and top speed rpms.

What Plmlk said.....That is what is causing the white excessive oil. Open the motor up after trolling and warm it up. It will be gone. Oh'' The. white oil is caused by cooling being not up to the right temp. Running 2 long at idle.

unburned oil is an issue if you are running at low rpm's like mentioned don't know if you pull the boat out of the water, but if you do, the unburned oil drips out and is usually very dark, almost black as a precaution, I would also take a look at the oil in the lower unit to be sure it isn't milky or low

That happens frequently to smaller motors that are only used for trolling... Your motor needs 50:1 at WOT, but could likely get by at 75:1 at idle. When you mix your fuel at 50:1 and don't get above idle speeds all of the oil does not have a chance to burn off, and you see what you are describing... Every once in a while open her up to WOT.

yes, they would float to the top and burst into a sheen on the surface of the water

Could be a leaking lower seal on the prop shaft, are these floating to the top of the water?