Thread: Seafoam or Marine StaBil

Wow:

Yamaha says of it's V-6 4 stroke:

"Next-generation engine block features plasma-fused sleeveless cylinder walls, which are 60% stronger than steel, and much lighter."

I am not sure what this means, plasma on aluminum, IME, would vaporize it, so I have no idea what they are doing here, but it sure is intriguing! If it is 60% harder than steel, no matter what it is, it is not going to be very mailable, so it is not going to be easy to gall, but again, I am going to talk to my mechanic when I pick up the boat. In the mean time, I am going to try to figure out what this plasma fusing is all about!

Found it;

"Plasma fused simply means an alloy dust, comprised of chrome, nickel, manganese and other elements, is super-heated in a plasma process and fused to the cylinder wall."

So it's akin to a sleeve in it's effect, but is apparently fused into the aluminum. I would guess that they have to be bored and sleeved to rebuild them though.

Even if you do run the carb out of fuel, you still have fuel in teh bowl. It is never completely empty unless you drain the fuel bowl.

Originally Posted by Hanr3

Even if you do run the carb out of fuel, you still have fuel in teh bowl. It is never completely empty unless you drain the fuel bowl.

True, and if memory serves the last Mercury carbs I rebuilt had small holes in the bowels which very much affected performance. That said it does drain most of the smaller orifices, and I think it's still better to run it dry, but I could be full of it, I am far from an expert. Whether or not you run the carbs as dry as you can, it would seem that unless you want to run premium fuel, which has about the same additives as the cleaners, it's good to run the cleaners through now and again. I don't think that premium has the heavier concentrations of naphtha and the like that the additives have, if my understanding is correct running a tank of premium now and then will have a less dramatic effect.

Originally Posted by Drum_Master

Seems to me, that one cylinder would run out of fuel before the others, leaving it dry? Doesn't take much to gall aluminum. JMHO

One other thought, with oil injection this may not be an issue, though running an engine dry with oil injection may really gum up carbs... I am definitely going to chat with my mechanic about this!

I've heard the arguments on not pulling the fuel line, but I will swear by it for the engines running on premix oil/gas. I have a 1976 Johnson 115 motor that has always had the fuel line pulled and run until dies after every trip. This is a 35 yr old motor that still starts up and runs every spring without problem and no major repairs. I also am a fan of seafoam. I'm including the concentrated seafoam "decarb" treatment routine once each spring in my yrly maintenance process plus continuing to add seafoam to the gas at each fill-up. Tried the decarb process last spring and was thoroughly impressed. Kinda smoked up the whole lake where I was at though....lol.

HHD

if sea foam sits in your carb. bowels it wil dry up and cause u 2 have problems when u go 2 use it. like when it sits over 2-3 months. took out a fuel pump out of a 200 merc. he used sea foam ... id use marine stabil

Originally Posted by OU812

if sea foam sits in your carb. bowels it wil dry up and cause u 2 have problems when u go 2 use it. like when it sits over 2-3 months. took out a fuel pump out of a 200 merc. he used sea foam ... id use marine stabil

Could also go with Yamaha Ring Free Plus;

1,2,4-Trimethylbenzene (CAS# 95-63-6), 2%;
Petroleum distillate (CAS #64742-94-5), 25%
Proprietary additive (CAS#: Mixture), 70@
Xylene (CAS # 1330-20-7), 3%.

If you are not supposed to allow it to sit in the carb for sure Yamaha would tell you, the others are just pushing product, Yamaha sells engines, and if their product is destructive they might get stuck with warranty work... I would guess their product is one of the most expensive ones though.

Originally Posted by OU812

if sea foam sits in your carb. bowels it wil dry up and cause u 2 have problems when u go 2 use it. like when it sits over 2-3 months. took out a fuel pump out of a 200 merc. he used sea foam ... id use marine stabil

Could also go with Yamaha Ring Free Plus;

1,2,4-Trimethylbenzene (CAS# 95-63-6), 2%;
Petroleum distillate (CAS #64742-94-5), 25%
Proprietary additive (CAS#: Mixture), 70@
Xylene (CAS # 1330-20-7), 3%.

If you are not supposed to allow it to sit in the carb for sure Yamaha would tell you, the others are just pushing product, Yamaha sells engines, and if their product is destructive they might get stuck with warranty work... I would guess their product is one of the most expensive ones though. It is certainly one of the most complex as far as ingredients are concerned.