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  Yet another fuel/oil mix ?

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Author Topic:   Yet another fuel/oil mix ?
63WHALER posted 06-21-2003 02:11 PM ET (US)   Profile for 63WHALER  
I have an 1986, 6hp.Johnson motor and for the first time I noticed a little sticker with 100:1 mix. Can this be right? I'd like to use this as a kicker motor along with my 1982, 90 hp.Johnson and plumb using the same tank and mixture. Been using a 50:1 mixture for main motor, will this be alright for the kicker also?
whalernut posted 06-21-2003 06:55 PM ET (US)     Profile for whalernut  Send Email to whalernut     
I thought the older engines, regardless of their size were 50:1? I know, I have a 1980 9.9 and it took 50:1, so I would think 100:1 is way too thin, anybody know? Jack.
63WHALER posted 06-21-2003 07:38 PM ET (US)     Profile for 63WHALER    
Thats what I thought also Whalernut. The only reason I asked was becouse of the little decal by the fuel hook-up that said 100:1. Never heard this besides the 50:1 mix which is the standard or common. Any other ideas?

Thanks,
Kevin

Sal DiMercurio posted 06-21-2003 08:55 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Yes, for a few years OMC made those engines, it wont hurt a thing to run your 50.1.
The 50.1 thing is a thing of the past as the DFI engines use far less then the standard 2 stroke.
Merc & Yamaha DFI engines do use much more then the Evinrude DFI but still far less then the old 2 stroke.
For instance, theres a good discussion right now on the WMI boating board about it.
My 2000 - 200 hp Evinrude uses very close to 200.1 as 1.8 gallons of oil every 350 - 400 gallons of fuel.
The only time the 50.1 engines really need that much oil is at wot, compared to only needing approx 100 - 150.1 at idle.
The DFI engines do not mix the oil with the fuel, the fuel is measured precisely & atomized into the cylinder while the oil is sprayed into the crankcase & returned to the oil tank, using much much less then the pre-mix era.
Don't worry about running the little 9.9 on 50.1, wont hurt a thing.
Sal
jimp posted 06-21-2003 10:20 PM ET (US)     Profile for jimp  Send Email to jimp     
63 -

My 1986 Yamaha 6 takes 100:1. 50:1 won't hurt it.

FYI. Older engines used to take 25:1.

JimP

JBCornwell posted 06-22-2003 01:51 AM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
"Old" is a relative term when it comes to outboard engines, particularly OMC engines. There are thousands of pre-1960 OMC engines in regular service. I don't call them old unless they are older than Bigshot.

OMC specified 24:1 mix for 1964 and earlier engines. After that it has been 50:1, EXCEPT:

During the 80s OMC, Yamaha et. al. specified 100:1 for some small engines as a way to cut pollution. They must have assumed that those small engines would always be run at troll and idle speeds. They weren't and they broke.

OMC then recommended that 50:1 be used for "heavy duty" operation for those engines and stopped specifying 100:1 mixes.

If you ever get involved with small, air cooled outboard engines, treat them like chainsaws. 16:1 mix with chainsaw oil, not TC-W3.

Red sky at night. . .
JB

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