Black film on boat

[davet]

I have a 2001 20I with a 350 mpi mercruser motor. Runs great but every time I go to clean it up I notice a black film around the exhaust pipes. This is not a big deal but what is causing this? Bad gas? Injectors clogged or ? It doesn't smoke at all when it is running. Should I be concerned with this or is it common with fuel injected motors? Any info would be helpful....

[dogbert]

x2, I have a '99 with the same thing.

[samw]

x2, I have a '99 with the same thing.

I have an 01.
X3

[chpthril]

Pretty much normal, the soot is a combo of low engine temps (compared to autos) and lack of catalytic converters to finish the combustion process.



I see you are south of Hi Rock lake.........did you know about our Tige Owners day last month?

[dogbert]

Any ideas on how to get it off with out too much rubbing?

[davet]

Thanks for the info chpthril....no I didn't know about the T.O. get together....
We ride on lake tillery....its the closest to home....mainly on fridays when there's little boat traffic.....
To dogbert....I use a 50/50 mix of grease lighting and water....Just rub with a rag....I use an old toothbrush to get into ths small places....be sure to rinse off before it drys.....