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Posted: 3/20/2023 7:31:41 AM EDT
Snagged a Belgium manufacture '85 8HP OMC W/3 gal tank last weekend for $100. Had been sitting for a year outside. Good spark and compression. Replaced fuel lines, pull rope and epoxied some broken plastic bits and cleaned carb. Started right up but smoked a lot. After idling for a while it started to load up and would die on idle. Cowling says 100:1 oil mix, all I had was 50:1. Gonna try new plugs and 80:1 premix.
Thoughts ? |
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Posted: 3/20/2023 7:56:51 AM EDT
[#1]
I think if the cowling says 100:1 it probably needs 100:1
Why wouldn't you use the correct blend? |
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Posted: 3/20/2023 9:17:28 AM EDT
[#2]
Adding more oil, 50:1, literally made it lean not rich. Hopefully you didn't score the piston or cylinder wall. Follow what was instructed unless you know it was jetted for another ratio.
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Posted: 3/20/2023 12:41:56 PM EDT
[#3]
Most of the boat forums say to run 50:1 instead of 100:1.
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Posted: 3/20/2023 4:49:20 PM EDT
[#4]
The 100:1 rule was later changed for those motors and they went to 50:1.
Serious answer- They aren't making any more 2 strokes. It is worth it to spend money on decent synthetic 2 stroke oil and non ethanol gas. The best 2 stroke for outboards is Evinrude XD 100. Yes...it cost more than what you get at wal mart...because it is better. Buy it, mix it 50:1, and run that motor like it is built for speed. |
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Posted: 3/20/2023 6:39:32 PM EDT
[#5]
Quote HistoryOriginally Posted By akcaribouhunter: Most of the boat forums say to run 50:1 instead of 100:1. Yep. I've been running 50:1 in OMC's marked 100:1 for 45 years without a problem. I hate Champion plugs but for some mysterious reason they make little OMC's purr. It came with old NGK's. Another thing. The low speed jet was 4.5 turns (????) out from seated when I did the carb. I did factory spec 1.5 turns out and never fine tuned it when I ran it. These might be contributing issues. Gonna do some engine tuner Wed with the old plugs and let it sit for a few days then try the Champions and adjust the low speed better. |
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Posted: 3/20/2023 6:52:17 PM EDT
[#6]
Quote HistoryOriginally Posted By FedDC: The 100:1 rule was later changed for those motors and they went to 50:1. Serious answer- They aren't making any more 2 strokes. It is worth it to spend money on decent synthetic 2 stroke oil and non ethanol gas. The best 2 stroke for outboards is Evinrude XD 100. Yes...it cost more than what you get at wal mart...because it is better. Buy it, mix it 50:1, and run that motor like it is built for speed. They are still making plenty of two strokes. Their just not sold here. They are still popular worldwide. A quick run to the Bahamas and you can buy all you want.https://www.hbsmarine.com/two-strokes I ran XP-50 in my E-Tek OMC 115 religiously. Everything else gets a synthetic blend TC-3. |
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Posted: 3/21/2023 12:34:53 AM EDT
[#7]
Quote HistoryOriginally Posted By nowgrn4: Yep. I've been running 50:1 in OMC's marked 100:1 for 45 years without a problem. I hate Champion plugs but for some mysterious reason they make little OMC's purr. It came with old NGK's. Another thing. The low speed jet was 4.5 turns (????) out from seated when I did the carb. I did factory spec 1.5 turns out and never fine tuned it when I ran it. These might be contributing issues. Gonna do some engine tuner Wed with the old plugs and let it sit for a few days then try the Champions and adjust the low speed better. Quote HistoryOriginally Posted By nowgrn4: Originally Posted By akcaribouhunter: Most of the boat forums say to run 50:1 instead of 100:1. Yep. I've been running 50:1 in OMC's marked 100:1 for 45 years without a problem. I hate Champion plugs but for some mysterious reason they make little OMC's purr. It came with old NGK's. Another thing. The low speed jet was 4.5 turns (????) out from seated when I did the carb. I did factory spec 1.5 turns out and never fine tuned it when I ran it. These might be contributing issues. Gonna do some engine tuner Wed with the old plugs and let it sit for a few days then try the Champions and adjust the low speed better. I have run the mercury cheap oil in all my 2-stroke outboards with no problem. |
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Posted: 3/21/2023 7:39:56 AM EDT
[#8]
Quote HistoryOriginally Posted By akcaribouhunter: With the motor being a 1985 the gaskets and seals might be dried out. I have run the mercury cheap oil in all my 2-stroke outboards with no problem. I don't think they had a chance to dry out, the guy I bought it from ran it regularly for the last 15 years on his Jon. He upgraded to a 25HP last year and removed this engine and leaned it up against the side of his house. He just bought a brand new '15 X-Treme stick steer with a 60HP Yammy and offered me the still running good 25HP that's leaning against the side of the house too for a $100. lol. The biggest danger with 2-Stroke oil is mixing brands in a oil injection tank. Marine mechanic friend told me he has seen blown engines from oil gelling in the tank and restricting flow from mixing different brands. I would imagine this is a bigger issue up where you are in the cold. |
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Posted: 3/21/2023 12:44:47 PM EDT
[#9]
Quote HistoryOriginally Posted By nowgrn4: I don't think they had a chance to dry out, the guy I bought it from ran it regularly for the last 15 years on his Jon. He upgraded to a 25HP last year and removed this engine and leaned it up against the side of his house. He just bought a brand new '15 X-Treme stick steer with a 60HP Yammy and offered me the still running good 25HP that's leaning against the side of the house too for a $100. lol. The biggest danger with 2-Stroke oil is mixing brands in a oil injection tank. Marine mechanic friend told me he has seen blown engines from oil gelling in the tank and restricting flow from mixing different brands. I would imagine this is a bigger issue up where you are in the cold. Have had head gaskets dry out on my yammi 150. Even my 2-stroke snogos have had seals and gaskets dry out. Just something to check. |
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Posted: 3/23/2023 10:45:09 PM EDT
[#10]
I've seen 2-stroke oils gel up at the bottom of the reservoir
tanks more than once. I don't know if the oils were mixed, but I know some of them had been sitting for an extended period. The Mercury "on board" reservoir tanks like what's used with the V6's have a pickup tube with a fine mesh screen at the bottom. I've seen those clogged up with a thick, parrifin feeling coating that blocked oil flow. When we had all Merc 2-strokes in our rental fleet, we used the standard Mercury 2-stroke oil and never had any issues with jelling or oil related failures. IMO, using a synthetic or blend 2-stroke oil with a carbureted engine isn't necessary. DFI engines are a different animal and I'd use whatever is recommended by the MFG. An above poster is correct when he said that if you mix to 50:1 it will be lean on fuel. You may research if there was a jet change recommended when switching to 50:1 ratio fuel. |
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