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Old 22 August 2010, 09:45   #1
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Mercury 15

Hi All,

Brand spanking new to all of this and am after some advise please.

Just picked up a tidy Mercury 15 hp outboard and the guy thinks he may have flooded it when trying to demonstrate it to me but the long and short is that it splutters to life for about 5 seconds and dies. It hasn't been used for about 18 months so I am thinking plugs? old fuel?

Am I on the right tracks or are there any other suggestions?

Bongy
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Old 22 August 2010, 09:58   #2
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I'd drain out all the fuel and put some fresh stuff in first, take out the plug and check/clean it, and if still no joy, the carb probably needs some TLC
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Old 23 August 2010, 06:28   #3
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Yep. Thing is a flooded engine can usually be "pumped out". The oil slick round the leg (even if it's only petrol ) is the giveaway.

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Old 25 August 2010, 06:50   #4
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choke

Just bought a mint ( as new ) looking yamaha 20hp 2 stroke.

Looked so new I did not even try it, been stood for a few weeks (6 months??)

Started it at home, it died, black plugs.... cleaned plugs .... started, and dies.

Starting getting a little pished off as I should of started it before buying...

Noticed the butterflies on the chokes were stuck closed, little spray of wd40, and they worked perfectly. They spring open, but are not pushed open by choke knob.

I added a bit of grease to ensure they never stick any time soon....

Engine runs as new now.... was prob. cleaned with carb cleaner and got dry in that area.

Maybe your choke butterfly(s) is/are also stuck closed.......
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Old 25 August 2010, 16:10   #5
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Thanks ya'll

indeed the plugs were cruddy and I think the fuel was stale so changed all of that and with the cover off it runs a treat - perfect!

BUT- as soon as the cover goes on there is plenty of blue smoke and a lose of free reving so maybe the butterfly is stuck as you say?

where did you grease?
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Old 25 August 2010, 16:43   #6
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Originally Posted by Bongy View Post
Thanks ya'll

indeed the plugs were cruddy and I think the fuel was stale so changed all of that and with the cover off it runs a treat - perfect!

BUT- as soon as the cover goes on there is plenty of blue smoke and a lose of free reving so maybe the butterfly is stuck as you say?

where did you grease?
May be your exhaust gasket leaking and strangling it with exhaust gases.

If not, is the cover air intake blocked?
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Old 28 August 2010, 16:17   #7
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If it's running ok or ok ish, the choke is prob. ok.

I wd40'ed the carb sides and worked the butterflies by hank, on the end of the carbs there is a pivot and I greased this small area both sides, you can see the shaft rotate if you pull the choke knob as you look at the carb sides...
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