How to decarbon a 4 stroke

[TnTommy]

I’ve been looking into removing carbon deposits from my evinrude 50hp 4 stroke fuel injected, E50PL4SS, the manual says this should be done every 50hrs I bought the boat this summer and I doubt this has been done in the last 10years. The manual calls for Evinrude/Johnson engine tuner.The directions are to spray it in carbs or air intake, so with no carbs where would I spray it?

 

[racerone]

I would not worry about doing this.------Most 4 stroke engines in pickup trucks have not had this procedure done in 10 years ( 150,000 miles ) either.

 

[TnTommy]

Was also wondering if it was necessary?

 

[Crosbyman]

the 2005 version of an ETEC as a direct oil feed into the incoming fuel line for purpose of mixing in ..."some " X100 oil with Carbon gard.

you could always mix some in say 100/1 in your fuel supply or look at Evinrude products to mix in the fuel .

Some folks like SEAFOAM (see utubes) some folks don'T like it.

now the question... Having any problems ?

 

[airshot]

If it really concerns you, remove the plugs and spray in some SeaFoam, turn the engine over a few times with no ignition. Let sit for a few hours, if really bad do that a second time. Put plugs back in and fire it up. If there were lots of carbon buildup it will smoke like crazy, if not much carbon then lighter smoke. Being a four stroke, I would not expect much smoke, usually not much carbon buildup in them. If your engine is running well, why bother? Don't try fixing what isn't broke....

 

[saltchuckmatt]

Every 50 hours? Show us where you found that.

I find it hard to believe.

 

[Mc Tool]

A modern 4 stroke should not need de-carboning ..........unless is burning oil for some reason ( and then de-carboning would be the least of your problems ) or if someone has sugared your tank .
If , like me , you just want to love your motor a bit there are other worthwhile things you can do .

 

[TnTommy]

Every 50 hours? Show us where you found that.

I find it hard to believe.

This is out of the manual for the engine

 

[TnTommy]

A modern 4 stroke should not need de-carboning ..........unless is burning oil for some reason ( and then de-carboning would be the least of your problems ) or if someone has sugared your tank .
If , like me , you just want to love your motor a bit there are other worthwhile things you can do .

I was wondering if this was actually needed

 

[TnTommy]

If it really concerns you, remove the plugs and spray in some SeaFoam, turn the engine over a few times with no ignition. Let sit for a few hours, if really bad do that a second time. Put plugs back in and fire it up. If there were lots of carbon buildup it will smoke like crazy, if not much carbon then lighter smoke. Being a four stroke, I would not expect much smoke, usually not much carbon buildup in them. If your engine is running well, why bother? Don't try fixing what isn't broke....

It is running good

 

[Mc Tool]

I was wondering if this was actually needed

Used to be a regular thing , specially on 2 strokes , that one had to de carbon things as the fuels and oils of the old days were not so clean burning .

 

[tpenfield]

The directions are to spray it in carbs or air intake, so with no carbs where would I spray it?

I think the choice is in the directions . . .

 

[dingbat]

Like most modern 4 strokes motors, this motor appears to be throttle body injected.

Remove the breather and spray the your "Snake Oil" of choice in the throttle body

 

[TnTommy]

Like most modern 4 strokes motors, this motor appears to be throttle body injected.

Remove the breather and spray the your "Snake Oil" of choice in the throttle body

Thanks for the answer I just wanted to be sure before I did it, although now I’m not sure I should

 

[Mc Tool]

Thanks for the answer I just wanted to be sure before I did it, although now I’m not sure I should

Its not wether you should , coz a bit of sea foam or whatev isnt going to hurt at the least , its just debatable wether you need to . Tother hand its relatively cheap and easy and may well have a positive effect .