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18 June 2012, 13:30
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#1
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Member
Country: UK - England
Length: 5m +
Join Date: May 2012
Posts: 59
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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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18 June 2012, 14:18
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#2
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Member
Country: UK - England
Town: Lyndhurst
Boat name: Airborne
Make: SR4
Length: 4m +
Engine: 40hp
Join Date: Oct 2011
Posts: 216
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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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18 June 2012, 14:27
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#3
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Member
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,252
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Quote:
Originally Posted by Nathan k
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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fuel injection 3.5hp 
I would just drain fuel & clean plugs as you say.
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18 June 2012, 14:29
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#4
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Member
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,893
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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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18 June 2012, 14:32
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#5
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Member
Country: UK - England
Town: Lyndhurst
Boat name: Airborne
Make: SR4
Length: 4m +
Engine: 40hp
Join Date: Oct 2011
Posts: 216
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Quote:
Originally Posted by Erin
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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18 June 2012, 14:38
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#6
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Member
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,252
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Quote:
Originally Posted by Nathan k
What size do they start using fuel injection? I guess there's no emission problems on a 3.5hp
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I don't think you will get less than 40hp
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18 June 2012, 14:39
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#7
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Member
Country: UK - England
Length: 5m +
Join Date: May 2012
Posts: 59
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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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19 June 2012, 14:39
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#8
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Member
Country: UK - England
Town: Marple
Make: Zodiac
Length: under 3m
Engine: Tohatsu 9.8
Join Date: Jun 2009
Posts: 657
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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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22 June 2012, 17:11
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#9
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Member
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
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Join Date: Apr 2007
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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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22 June 2012, 17:31
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#10
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Country: UK - England
Town: Plymouth
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Join Date: Mar 2011
Posts: 2,693
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Quote:
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Originally Posted by Nathan k
What size do they start using fuel injection? I guess there's no emission problems on a 3.5hp
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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 ?
Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
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22 June 2012, 18:21
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#11
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
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Join Date: Feb 2008
Posts: 12,178
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Quote:
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Originally Posted by Boats&Outboards
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 ?
Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007 |
There's a 25hp Etec as well
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22 June 2012, 18:29
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#12
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Member
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
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Quote:
Originally Posted by bad_moose
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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22 June 2012, 19:56
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#13
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Member
Country: UK - England
Town: Lyndhurst
Boat name: Airborne
Make: SR4
Length: 4m +
Engine: 40hp
Join Date: Oct 2011
Posts: 216
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Quote:
Originally Posted by Boats&Outboards
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 ?
Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007 |
Just say it saves the environment and you'll be rich
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24 June 2012, 22:36
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#14
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Member
Country: UK - England
Town: South Yorkshire
Boat name: Sold it !
Length: 3m +
Engine: Totallyhotsue 9.8 2S
Join Date: Sep 2011
Posts: 258
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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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27 June 2012, 13:40
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#15
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Member
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,893
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Interestingly, Suzuki now do a 15hp fuel injected outboard that does not need a battery.
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BLACK PIG
Piglet
