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Old 18 June 2012, 07:30   #1
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Wrong fuel mixture

Someone borrowed my 3.5hp 4 stroke mariner outboard and put fuel mixed for a 2 stroke engine in it. Is it just a case of draining the fuel out of the tank and cleaning the spark plugs or do I need to do other stuff too? I don't want to spend ages trying to sort it out only to get it wrong so any advice would be appreciated.
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Old 18 June 2012, 08:18   #2
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carbed or fuel injection? if it's carbed then undo the drainage screw and flush fresh petrol through. Not sure if a 4 stoke would run with 2 stroke but if it has been running might be worth using some seafoam to clean it all out.
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Old 18 June 2012, 08:27   #3
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carbed or fuel injection? if it's carbed then undo the drainage screw and flush fresh petrol through. Not sure if a 4 stoke would run with 2 stroke but if it has been running might be worth using some seafoam to clean it all out.
fuel injection 3.5hp

I would just drain fuel & clean plugs as you say.
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Old 18 June 2012, 08:29   #4
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I don't think they've fuel injected 3.5hp yet
Just put fresh neat petrol in it and don't worry. It may smoke for a bit but no harm will have been done.
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Old 18 June 2012, 08:32   #5
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I don't think they've fuel injected 3.5hp yet
Just pit fresh neat petrol in it and don't worry. It may smoke for a bit but no harm will have been done.
What size do they start using fuel injection? I guess there's no emission problems on a 3.5hp
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Old 18 June 2012, 08:38   #6
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What size do they start using fuel injection? I guess there's no emission problems on a 3.5hp
I don't think you will get less than 40hp
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Old 18 June 2012, 08:39   #7
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Okay dokay, brilliant I'll just drain it and clean the plugs. Any idea how tight I should do them up when I put them back?
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Old 19 June 2012, 08:39   #8
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Just drain the fuel tank, fill it with fresh fuel, and start it up. It will probably run fine and in this case l would say there's no need to touch the spark plug.
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Old 22 June 2012, 11:11   #9
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It'll be just like an over oiled 2- stroke... Just give it a couple of mins at full chat and your plugs will clean themselves.
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Old 22 June 2012, 11:31   #10
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What size do they start using fuel injection? I guess there's no emission problems on a 3.5hp

Merc do a 25hp EFI, I think that's the smallest out there. You may have hit upon a line line though at 3.5hp EFI, I may need to adapt it to SFI though at that small a size, Syringe Fuel Injected. Do you think it'll catch on ?

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Old 22 June 2012, 12:21   #11
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Merc do a 25hp EFI, I think that's the smallest out there. You may have hit upon a line line though at 3.5hp EFI, I may need to adapt it to SFI though at that small a size, Syringe Fuel Injected. Do you think it'll catch on ?

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There's a 25hp Etec as well
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Old 22 June 2012, 12:29   #12
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Okay dokay, brilliant I'll just drain it and clean the plugs. Any idea how tight I should do them up when I put them back?
You can use up the 2 stroke mix in any old yard equipment or even the outboard itself if you dilute the oil down a bit. 1:50 will smoke and foul the plugs but 1:200 will hardly be noticed. How big is the tank?

Plug torque is in your manual or you can make an educated guess with this table
Spark Plug Installation Instructions
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Old 22 June 2012, 13:56   #13
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Merc do a 25hp EFI, I think that's the smallest out there. You may have hit upon a line line though at 3.5hp EFI, I may need to adapt it to SFI though at that small a size, Syringe Fuel Injected. Do you think it'll catch on ?

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Old 24 June 2012, 16:36   #14
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It will be fine just add some extra petrol and give it some rpm. My honda 4 stroke mower loves old 2 stroke. All 4 strokes can burn oil and the 2 smoke oil may actually do some good and give it a good clean out.
Other old mix goes in the Subaru with extra petrol added.
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Old 27 June 2012, 07:40   #15
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Interestingly, Suzuki now do a 15hp fuel injected outboard that does not need a battery.
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