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+--- Thread: 2 Stroke fuel to oil ratios???? (/showthread.php?tid=533191)
2 Stroke fuel to oil ratios???? - BADFISH - 10-02-2009
I have recently accquired a 9.9 horse power tiller steer sears gamefisher outboard motor produced for sears in approx 1982 or 1983 by Eska with Tecumseh cylinder heads (air cooled I think)
The info I have found so far says to mix oil and fuel at a 50:1 ratio. BUT with the new "technology" in outboard oils for 2-stroke motors I was wondering what ratio I should mix at? Any advise on this? I had it going with a 40:1 mix I use in my weed whacker but it seemed to still produce an abundance of smoke emissions. would it be safe to run a 25:1 ratio in here and go with roughly half the oil? or should i keep it to a higher ratio?
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - fish_or_die - 10-02-2009
I've got an 84 merc 7.5hp that runs a 50:1 and doesn't smoke at all, never had a problem with it. Also I just got a 76 merc 9.8hp that runs the same mixture just fine. I've never tried to change the mixture, don't know why you would. What's your reason for wanting to change it?
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - grzbear10 - 10-02-2009
Unless I am mistaken you are thinking backwards.
50:1 is 50 parts gas 1 part oil
40:1 is 40 parts gas 1 part oil
25:1 is 25 parts gas 1 part oil
So 50:1 is leaner and less smoky than 40:1
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - FishNCoach - 10-02-2009
You want 50-1 Ratio, If you go to Sportsmans or Cabellas you can buy a pre-mix bottle that has all the markings on it, (it ia tall a skiny) look for the ratio you want, and the amount of gas, and fill the bottle to that mark, easy as 1-2-3, good luck>
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - wiperhunter2 - 10-02-2009
You need to stick to 50:1, [url "http://www.bigfishtackle.com/cgi-bin/community/community.cgi?do=user_page;pg=user_profile_view.html;username=grzbear10"][/url][#000000][/#000000]grzbear10 is correct on the mixtures, 40:1 has more oil than 50:1. I would stay with 50:1 unless it is an oil injected engine, they mix it for you[
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - richyy31 - 10-02-2009
I also have the same Game fisher motor but mine is a 15HP I run it at 50:1 and it runs great these motors where sold by sears but where made by merc. Bu a good oil also and you'll have less smoke I run a full synthetic two stroke oil.
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - Coldfooter - 10-02-2009
IMHO,, I have to cast, no pun intended, my vote for 50:1 also.
For older engines, if a person is concerned about engine wear and so on, 40:1, even 35:1 or 30:1 will help provide a little better protection against internal wear. But you will get more exhaust smoke..
I have a 1943 Champion 5hp that runs like a little clock and has yet to be overhauled. I run 40:1 in it simply because of its age.. I'm far from a "tree hunger" so the little bit of extra smoke the higher oil to gas mixture creates dont bother me. And truly, its hardly noticeable
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - LimitOut - 10-02-2009
When you say you were using a 40:1 mix used in your weed whacker i assume (and hope) you are referring to the ratio only and not that you are actually using the oil used in your weed whacker? Big difference between the oils and it will smoke much more with that oil.
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Re: [LimitOut] 2 Stroke fuel to oil ratios???? - wiperhunter2 - 10-02-2009
Welcome to the site LimitOut, I've got a question for you. What type of oil do you use in your boat motor? I don't do it often but I have used the same oil in my weed eater that I use in my boat motor, just a different ratio. I realize that oil injected engines might be different but do you really think that it makes that much difference in older motors? I remember reading a decal on an older trolling motor I had and it said to use 30 wt motor oil in the oil/fuel mixture. Just curious, I'm really not sure[:/].
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Re: [wiperhunter2] 2 Stroke fuel to oil ratios???? - LimitOut - 10-02-2009
[font "Times New Roman"]Marine TC-W 3 is very different from "normal " 2 stroke oil. The crankshaft bearings in your outboard are very different from those in a chain saw, a weed whacker, or a lawnmower. The reed valve/carb setup is also very different. TCW means "Two Cycle Water-cooled" and any other oil is formulated for air-cooled engines which typically have higher combustion temps. A water-cooled outboard won't generate the heat required to burn regular 2 stroke oil off (hence the excessive smoke), especially if you aren't running at WOT most of the time. Excess unburned oil means more and faster carbon build-up on cylinder walls, piston crowns and transfer ports. Coked-up cylinders lead to sticky rings, lost compression, lost power and ultimately, catastrophic engine failure. [/font]
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Re: [LimitOut] 2 Stroke fuel to oil ratios???? - wiperhunter2 - 10-03-2009
Wow, I had no idea, thanks for sharing that info. I use a good quality two cycle oil made by Valvoline and it says
TCW3 on it, sounds like I'm ok. Now I know what to use in my boat motor but what about my weed eater, will it hurt it to use my boat motor gas in it or will it cause it to over
heat? WH2
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Re: [wiperhunter2] 2 Stroke fuel to oil ratios???? - FishingSteve - 10-18-2009
I have worked on motors for years, what I have found is, if you buy a good oil and mix it to what it is rated for, rather it is for 100 to 1 or 25 to one you will be fine. My favorite is penzoil for air cooled motors, it leaves less deposits and smokes very little. If it is a water cooled motor, I will use the chevron TCW-3.
One other thing that I should add is that if you have a oil injection system, make sure that you always buy at least the oil with the ratio that the oil pump injects it to. Most manufactures are at 50:1, some are at 100:1.
Hope this helps.
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Re: [FishingSteve] 2 Stroke fuel to oil ratios???? - frontier - 01-27-2010
Most motors run 50-1 but newer oil injected models idle at 100-1 then adjust more oil as engine is rev. Those oil bottles made in china can be way off FYI. I tossed mine out long ago. Get walmart pint that mixes with 6 gallons fuel dump oil in bottle see where it goes. My level went way higher so motor would receive less oil. Strange i know!
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Re: [BADFISH] 2 Stroke fuel to oil ratios???? - NatefromOgden - 01-30-2010
One more thing about oil ratios- oil burns hotter than gasoline so increasing the amount of oil in the fuel tank, (40-1 as opposed to 50-1) will cause the engine to run hotter than desireable. Since your troller is air cooled, you probably need to keep the 50-1 ratio as prescribed.
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