Smoking Johnson 150's

[25whaler]

I have twin 1986 150 Johnson's they seam to smoke a little more than normal. I have changed plugs (champion), running ram ficht oil. T stats are working properly. I have premixed and also with new vro. When I premixed the oil line was plugged. so the oil mix was 50 to 1 with no real difference in smoke. I notice it heavy at start up and then as motor warms up tails off slightly but still too much smoke. I am planning to decarb this weekend. Did a compression check on both and compression is within 10% between cylinders. Can anyone suggest what I am missing or what else to try?? I would love to repower but its not an option right now. Thanks in advance.

[Mumblerone]

I have the same problem...it's normal with my motors (1996).* They love oil.**Sure beats not having enough oil. *

[Kamper]

Are you sure it's smoke and not steam? I'm not the least bit familiar with Evinrude/Johnsons except what I've read but if you have a water-jacket over the exhaust manifold it's possible a loose nut or faulty gasket is allowing water into the exhaust manifold where it will turn to steam.

If you test the nuts and any of them are loose I suggest replacing and resealing those gaskets.

Good luck!

[capt. tim]

Check with mechanic....You might be running a rich mixture of oil causing the additional smoke....There is an adjustment you can make for the mixture...Not sure where it is on your motor...Decarb is a good idea too!....Tim

[horseradish]

If you're "pre-mixing" instead of using the VRO you are always going to get smoke due to the higher than normal *oil/gas combustion mixture. The whole purpose of the VRO is to add only that oil that is needed at any given rpm. It does NOT pump out at a constant 50:1 ratio!

VRO were developed, not to save you the hasstle of pre-mixing, but to add only the oil that is actually required by the engine .

Disconnecting your VRO if like disconnectioning your electric start and going back to a rope!

[25whaler]

thanks for the posts. I will try decarb. Pretty sure its oil and not steam but going to check anyway. thanks again.

[ccm]

Run ringree or valvetect regularly in the gas if its premix. If you have smoke you know your getting oil. The old Johnsons love gas and oil. Feed it to them and they run forever.

[twentynine]

Man I know what you talking about.

I had a kidney stone last week and my johnson was smokin!!!!!!!!.

Sorry, had to do it. Couldn't resist, promise it won't happen again.