foamy gunk in prop exhaust

[pedixon]

Hi all
Sometimes when I run my 15 hp evinrude in the yard with the muffs on a grayish foamy gunk comes out the prop exhaust when I shut the motor off. Is this trouble.


Phil

 

[rjezuit]

Re: foamy gunk in prop exhaust

If it is a thru hub exhaust it is completely normal. Unburned fuel and oil whipped up in the water by the prop/exhaust port. It does this all the time, but in water where you are moving it does not build up, so you don't notice it.Rick

 

[kenmyfam]

Re: foamy gunk in prop exhaust

Most likely unburnt 2 stroke oil.