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Old 14 April 2011, 06:39   #1
Country: UK - Channel Islands
Town: Guernsey
Boat name: Betty
Make: Tornado
Length: 5m +
Engine: 75 mariner outboard
Join Date: Jul 2010
Posts: 2
2 stroke 75 mariner

Can anyone advise me why my 2 stroke 75 mariner will start but only run for about 3 seconds before cutting out. Iv changed the fuel so I dont think it dirty fuel??

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Old 14 April 2011, 09:48   #2
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,538
Prepare to be asked 100 more questions!

First one - Actual three seconds or figuritive? If it can self suistain for a short time that may eliminate some causes (like no deadman in kind of thing) Likewise if it coughs & dies as soon as you let go the switch....

It's either going to be fuel or electrics related. I'll try to talk you through the thought process if stuff like that happens to me:

1) Engine cold or hot? If hot, post back, if cold, read on.....

2) How quickly do you put the fast idle / choke back? Not many outboards need choke for more than the time it takes to crank the engine, but I have one that won't idle without half choke for the first 5 mins..... (granted that's impossible with an electric choke solenoid, mine is a tiller control pull start machne) Might be worth trying to hold the fast idle lever up for a wee while longer. If that works, chances are your idle adjusters need tweaked or you got a blocked idle jet. If that fails, read on.

3) Any beeping noises as it happens / after the event? If so, dig your manual out, that will at least give you a step for a hint as to what to look for next (i.e what is an"instant shut- down", what that beep pattern means it thinks is wrong kind of thing. If not.....

4) This is where you need to get your hands dirty. Check all fuel lines for leaks & blocks (incl. the filter on the engine). If you have clear hose between your fuel pump & carbs, look for bubbles. Having said that I would doubt it would die after (literally) 3 seconds - most engines will run for a good 3 or 4 mins at idle when you disconnect the fuel., which is why I am thinking idle jets There is another live thread lurking here at the moment with a good description of checking your fuel lines.

If none of that (or any subsequent posts) help, post back & tell us exactly what happened.....

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Old 14 April 2011, 11:37   #3
neil.mccrirrick's Avatar
Country: UK - England
Town: Oldham
Boat name: Nemanda
Make: Aluminium
Length: 6m +
Engine: 140hp Tohatsu
MMSI: 235065639
Join Date: Jan 2008
Posts: 819
If you prime again and start up, does it start straight away? It sounds to me like it needs choke for longer as 9D280 says
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Old 09 May 2011, 13:45   #4
Country: UK - England
Town: Northampton
Make: RibTec
Length: 5m +
Engine: Outbaord mariner 75
Join Date: Apr 2011
Posts: 506
Any luck. ?
My 75 mariner needs the choke on for the first time for about 5 to 20 seconds depending on how cold it is.
and a but of throttle.
once its warm its just a quick flick of the key and its away.
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