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Small 2-stroke OB fuel cocktail?

Old 11-01-2018, 08:00 AM
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Default Small 2-stroke OB fuel cocktail?

I have literally new out of the box 2005 Johnson 15hp on my duck hunting boat. I really want to keep this thing in tip-top shape.

What is everyone running for pre-mix 2 stroke additives?

Right now I use Mercruiser 2-stroke oil, a de-carb and a stabilizer.

I was thinking about going to a synthetic 2 stroke oil like Penzoil marine, Startron Carb Free and Startron Stabilizer? Thoughts?
Old 11-01-2018, 08:16 AM
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Pennzoil XLF Oil
Marine Stabil always
Seafoam decarb every 40 - 50 hours
Old 11-01-2018, 08:19 AM
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Pennzoil oil @ 50:1, Non-ethanol gas, and an anti carbon additive. I use Yamaha ring free, as it is the most easily accessible.
Old 11-01-2018, 08:23 AM
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Pennzoil synthetic blend, ring free (either Yamalube or Startron), sta-bil, and the most important item.... NON-ETHANOL gas. I go out of my way to a specific gas station to get it and pay like 40-50 cents more a gallon but I feel like it is worth it.
Old 11-01-2018, 08:25 AM
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Awesome info so far guys. Thank you.

Two questions:

1) Run de-carb/ring free type stuff all the time? Or at intervals? Will it hurt the motor?
2) Will synthetic 2 stroke oil hurt my older motor?

I wish I could get non-ethanol gas. I'm in NJ.
Old 11-01-2018, 08:28 AM
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In my mind de-carb is when you use a very heavy dose to clean the engine which only needs to be done periodically. A ring free type treatment is a low dose that is intended to prevent any build up. I use ring free at every fill up. At the 1 oz per gallon dose it is cheap insurance.
Old 11-01-2018, 08:30 AM
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Penzoil synthetic and Sea Foam fuel treatment. Sea Foam is a great for preventing ethanol issues. My 2000 Yamaha 115C has never had a hiccup since using this combo.
Old 11-01-2018, 08:30 AM
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Originally Posted by HookMeUpII View Post
Awesome info so far guys. Thank you.

Two questions:

1) Run de-carb/ring free type stuff all the time? Or at intervals? Will it hurt the motor?
2) Will synthetic 2 stroke oil hurt my older motor?

I wish I could get non-ethanol gas. I'm in NJ.
Run an anti carbon additive all the time. If you do that, there will be no need for periodic decarbing unless you idle the motor a lot. Ringfree is expensive, but mixes at 1oz per 10 gallons of gas, so cheap in application to use. No issue with synthetic oil. I personally run the Penzoil synthetic blend because it is 1) good oil, and 2) available nearly everywhere. Make sure you are using a marine oil, and not something made for chain saws or dirt bikes.
Old 11-01-2018, 08:31 AM
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If it's brand new and hasn't been broken in, you may want to increase the oil ratio a bit. Fresh hone peaks need a little extra lubrication until they wear down and seat with the rings.
Old 11-01-2018, 08:33 AM
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one of the best things you can do is run it WOT for a few minutes each time on the way home

where did you get that motor, that is a score!
Old 11-01-2018, 09:07 AM
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Originally Posted by rbhankins001 View Post
where did you get that motor, that is a score!
Craigslist. It was listed for sale for 3 hours. I called the shop. Asked about it. Hung up the phone and then called right back with my credit card and gave them a deposit. Freshwater used its whole life. When I arrived to pick it up the guy said I was lucky to have put the deposit down. Someone came in 5 min later with cash in hand.

It literally looks like it came right out of the shipping crate. It's my little 15hp pride and joy lol. I can't bring myself to camo paint it.
Old 11-01-2018, 05:36 PM
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So its not literally New. I would still run the first tank with a 25:1-35:1 mix of Pennsoil XLF and either Stabil or Startron stabilizer. After that Just use the 50:1 mix with a stabilizer. The TCW3 oil has all the cleaners in it you need and ethanol gas is a natural cleaner, not good for rubber and floats but a 2005 should have ethanol resistant hoses, seals and plastics in there already. You might want to change the plugs after the first tank or just pull and clean but probably not necessary.
Old 11-01-2018, 05:43 PM
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Originally Posted by HTJ View Post
Pennzoil XLF Oil
Marine Stabil always
Seafoam decarb every 40 - 50 hours
this. Throw some startron in too. Never will have issues
Old 11-01-2018, 05:44 PM
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Pictures?
Old 11-01-2018, 06:40 PM
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I use a 8 HP merc (1997) 2 stroke on my dinghy. Its 21 years old, still starts on the first or second pull. Runs like new.
Merc premium 2 stroke oil, 50{1, Marine stabil. Its never been in the shop.
Oh, yes. Change the plugs and lower unit fluids once a season.
Old 11-01-2018, 06:52 PM
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Originally Posted by rbhankins001 View Post
one of the best things you can do is run it WOT for a few minutes each time on the way home

where did you get that motor, that is a score!
This. You guys can go back and forth about additives all you want. Those little 2 stroke outboards run best at WOT.

Run it hard, and run it often. Worst thing you can do is let it sit for months. Stick it in a trashcan of water and run it periodically during the offseason.
Old 11-01-2018, 07:32 PM
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One other thing you might want to pick up is one of these,
Amazon Amazon
I have a 98 30hp Evinrude and was never sure if my prop was correct. I ran that motor for 18 years and never had a problem but recently with the cheap electronics I picked one up. I had to run with the cowling off but for the price it put my mine at ease that I was not over max RPM and now I use it on my chainsaw and lawn mower. I am not recommending this particular model but something like it.
My motor has run on TCW3 and Startron for 20 years and still starts on the second pull cold and first pull warm. The new synthetic has reduced the smoke and is worth the little extra.

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