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Old 12 April 2015, 04:52   #1
jwatson's Avatar
Country: UK - England
Town: Saddleworth
Boat name: Local Hero
Make: Avon
Length: 4m +
Engine: Mercury 50hp 3cyl
Join Date: Jun 2014
Posts: 253
Merc mariner 25 spluttering on pick up

So having seemingly solved my blocked idle jet issue, the boat idles and seems to be ok flat out, but In between the two is far from ideal! As I increase the throttle it coughs and splutters before finally agreeing to increase revs! Could my mixture need addressing?

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Old 12 April 2015, 06:51   #2
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 851
Richen the idle air mixture to about one and a half turns out from lightly seated, if that is what it is set at now, richen the mixture by an other one quarter of a turn out from lightly seated. If its still the same are the sparkplugs the correct ones and is the gap correct?

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Old 12 April 2015, 08:09   #3
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 2,482
As Uncle Al says....

Assuming plugs new(ish) and correctly gapped as a good starting point then idle mixture sounds weak (well it's the very easiest thing to sort and then if it's the same after ajustment look for the slightly more complicated stuff). There was a thread last year on this and the Mercury 15 2-stroke I bought about that time was set too weak at idle and did just the same on transition from idle to powering away. All sorted with the proper setting of the idle jet.

2 stroke "sneezes" then cuts out
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Old 14 April 2015, 12:07   #4
Country: Canada
Town: Southern Ontario
Boat name: -Unknown-
Make: SeaMax
Length: 4m +
Engine: Merc/Minn Kota
Join Date: Mar 2012
Posts: 216
Tune-up time. If more, it will be detected during a scope connect.
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