9.9 2stroke question

[Tips Up]

I just bought a 1986 9.9 Evenrude. It looks like brand new. Never been in salt water. It starts up and runs great. Runs at 100:1

The past owner used it 3 weekends per year for the 5 years he had it and had bought it off an old timer who took great care of it.

After test running it on the hose for a bit there is a grey sludge that comes out the exhaust port in the center of the prop.
Any ideas what this could be?

The guy I bought it from ran it about 80:1 as he felt "safer" doing this. It had not been used since June and is stored indoors.

I am thinking it is just unburnt oil? Maybe from running too rich and maybe from test running it from a tank that had been sitting for a while?

Thanks.

Tips

 

[Striker]

That's oil mixed with water. Here is a great site with info for that motor.... http://www.sschapterpsa.com/ramblings/Johnson 9.9_15.htm

 

[Tips Up]

Thanks for the link. For some reason I can only get part of the article to show and did not see anything relating to the problem. I will try again in a bit.
Is this water oil mix coming out normal? OK?

Thanks

Tips

 

[Striker]

Both my outboard do the same thing, so I think it's pretty normal.

 

[ratherbefishing]

I had an old 2 banger that did the same thing. It was unburnt oil mixed with water. As far as I know they guy I sold the engine to still uses it regularly which means the engine is on its 20th year...

 

[Tips Up]

Thanks again for the feedback Striker. Finally got the rest of the page to download and it seems normal and not a concern.
I think I scored a great motor at a great price.

It will do me until I find the 6-8 horse that I really want.

Tips

 

[Striker]

That article says that the 100 to 1 ratio for that motor has been changed to 50 to 1. Too many motors seized up at 100 to 1 ratios.

 

[danthewire]

Had an early 90's evinrude 9.9 same thing with the sludge, I also ran a little more oil then they recommended.Sold it to my buddy still going strong.DAN

 

[ReelAffair]

also some of the cheaper 2 stroke oils leave a sludge as well

 

[esora]

Tips Up

If your not going to use this at higher RPM then 100-1 is Ok, But at higher RPM the motor is starved for oil. I would suggest using 50-1. I learned the hard way, by following the manufacturers directions. Evinrude I believe put some literature out, but I can't find it.

Esora

 

[westcoast advneture]

The oil sludge is normal as the exhaust is routed though the prop on the 80's evinrudes. I flush mine in a garbage can after running it in the chuck and it is there every time. Loved thos 76-90 johnny/rudes. You had to try really hard to kill them. 50:1 is the propper ratio.