How to decarbonize 2004 Johnson 4-stroke?

[tony_cliffy]

My owner's manual says I should decarbonize my 2004 4stroke Johnson (115HP) but I'm not sure how to do it, or how to tell if it is truly needed. I don't live near a marine dealer so will have to drive an hour to get a can of whatever is needed. My local autoparts store carries Seafoam though.

 

[Silvertip]

Re: How to decarbonize 2004 Johnson 4-stroke?

you should not have any substantial carbon build up. My suggestion however, is since SeaFoam is available in your area, use it in the fuel as a preventive measure. Do a search for "Decarb" on this forum. It is covered in a number of threads.

 

[iwombat]

Re: How to decarbonize 2004 Johnson 4-stroke?

The techron/techroline additive in chevron gas is about as good as it gets for cleaning a 4-stroke. Run a few tanks of that, or go get a bottle of it from the auto parts store and add it in. Seafoam is a good choice too. Whatever you choose, you probably don't need to go the full route of 1-can:1-gal for a decarb like a 2-stroke.