Carbon build up on four strokes??

[spa]

Does any one use a additive to the gas on their yammiee four strokes ?If so what kind and does it help......

thanks in advanced

[Phil T.]

In theory, at least, there should be no more problem with carbon buildup in a 4-stroke outboard than in an automobile engine. If you suspect that prolonged icling is causing a buildup, an automobile gasoline additive would be correct.
If you like buying from a marine dealeer, OMC's Carbon Guard is labelled as being correct for both 2 and 4-stroke engines. Otherwise, any of the "injector cleaner" products from an auto supply store should be good. Most of that stuff is just penetrating oil in an different can, anyway.

[Eyecon]

Good question,I'm trying to figure that out myself. I've been told to use Yamaha Ring free,but at $7.95 for 12oz forget it. If I remember right I think it called for 2oz per gallon(shock treatment)times 36 of fuel,thats over forty bucks a tank. OMC Carbon Guard is a good product for less money. I'm in the process of trying the Sea Foam,to early to tell if its working yet.Good Luck!

[WeeWa]

you can use TECTRON by Cheveron ,it's in the black bottle. There are 2 diff. strenghts ,fuel inj. cleaner {weak} nand the valve/combustion cleaner (strong) I have seen someone post that they think Yamaha buys TECTRON and puts their name on it .Must smell the same??

[Bucks Rogers]

I started using 1 oz of Sea Foam per gallon in my tank to help a 175 Johnson that was coughing & sputtering. It took care of that problem but as an added bonus it helped my 9.9 hp Yammie 4-stroke that feeds at the same tank. Both motors seem to run a lot smoother now with less hesitation and sputtering at low RPM's. I only use it in every other tank of gas. (39 gallon on a Crestliner).
Bucks

[Dodge1]

I use Sea Foam in all my engines and it works like a charm. FYI - you can pick it up at any NAPA store.