This symptom can be caused by normal vibration. Check that the muffler is affixed tightly to the engine, and that the muffler halves are not loose.
Cheers,
I have what I believe is a problem and I want some input on it. I've got a
> OS FS 60 2-stroke that has started putting out BLACK smoke and oil residue.
> It's a pretty nasty color black. I'm concerned because all of my other
> engines put out fuel colored (pink/red) oil residue. The engine is 6 mos old
> and has had about a gallon of fuel through it. Prior ot that, I ran about 4
> tanks full through it very rich as per the instructions t break it in. I did
> buy it used. the person I bought it from said that he had only ran 2-3 tanks
> full through it to break it in. It used to put out red oil residue. motion
> seems free and it still seems to run fine.
> Have I run it too lean and am now burning engine? Is there anything I can do
> about it? should I inspect it in some way to see what is going on? I'm not
> afraid to take it apart, btu I don't know that I would recognize a problem
> if I saw it.
> I look forward to ya'lls input.
> thanx
> Mark
>
>