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Johnson 70 sludge at prop

tamarsabba

New member
"I have a 1970's 70hp that

"I have a 1970's 70hp that has had an overhaul a year ago and used about once before I purchased it.
It was also run a few times on land to demonstrate before I purchased.
The day after my first trip, there was a sludge coming out of prop area. Looked like foamy oil. I have checked the leg oil and it is full and free of water.
I did see somewhere information on these deposits being from oil in fuel not being fully burned or exhaust buiid-up. The information was not clear.
Can someone explain or give me an idea of what is happening?
Thanks!"
 
That is unburned fuel. Get you

That is unburned fuel. Get you some sea foam you can get it at most parts stores and add some to the fuel and be sure to put fresh fuel in to if the fuel has been in there since last year it needs to be removed.
Clean the plugs good to.
 
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