decarbonizing engine

[NGABaldEagle]

Back to it guys.
Its the 87 Merc classic 50 again.

20 year old engine that I recently became the owner of.

Runs almost perfect.

Doubt decarbonizing has ever been done.

Recommendations, methods, products, and sound advice is needed.

1987 Mercury Classic 50 HP
Its actually a 45 hp 4 cylinder according to the Merc manual via ser no.

Also the skeg is missing the last few inches....should I worry?
What does the skeg do?

 

[Plainsman]

Re: decarbonizing engine

http://forums.iboats.com/showthread.php?t=158076
Look here on how to do a decarb

 

[WillyBWright]

Re: decarbonizing engine

My preferred method is to use Power Tune by Merc after a hard run to get things good and warm. Treat it and do whatever it takes to kill at least 15 minutes on the water. I'm sure you'll think of something. Then take it for another hard but short run. Enough to clear things out.

Then I spray water from a mister into the carbs at high idle to do a bit of steam cleaning. Then go on my merry way, making sure it gets enough runtime to fully work that out too. The longer it takes me, the more I enjoy it.

Once a year is plenty, but twice the first year is best.

 

[Don S]

Re: decarbonizing engine

Just to add to Willies post, 15 to 30 min. is best. Don't leave it too long where it dries out. Maybe do it a couple of times if it's never been done. Running it under load and on the water where you can really load the engine is the only way to blow all the "Gunk" and buildup out of the engine. On a hose in the driveway just makes smoke, nothing more.
I like that water idea Willy. Never tried it before but really understand the steam cleaning effect of the water.