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80 hp mercury outboard starts and runs as long as you hold the key in the start possition. when you let the key go to the run possition it shuts off any help

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Contacts in your ignition switch are corroded. Some can be cleaned but some just have to be replaced at times.

Posted on May 22, 2012

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Posted on Jan 02, 2017

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2 Answers

Need a free manual for 1966 Mercury 3.9 hp outboard motor.


Don't use WD40, it is paraffin AKA coal oil

Sep 10, 2016 | Boating

1 Answer

I have a 1978 merc 85 hp outboard with a bad pump i purchased a used one that works mine has 4 hoses


Mercury Outboard Fuel Pump - Mercury Outboard Forums

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? 4:18
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Dec 01, 2015 | Boating

1 Answer

Are the controls for a 1998 15 HP 2 stroke Mercury outboard compatible with a 2011 30 HP 4 stroke Mercury outboard


If your old engine/control has the same 'options' as the30hp, yes everything is compatible... (Electric start or trim )
The throttle and shift cables are allways compatible...

Jun 25, 2015 | Mercury Marine 15hp & 20hp 4 Stroke...

1 Answer

What pins on the ignition switch are energized when when you turn the key on a 2003 mercury 15 hp 4 stroke outboard?


Red is Battery +
Red/purple is ignition
Yellow/red is startermotor
Black/yellow is motor kill
Black is ground

To have ignition, black/yellow wire must be disconnected
On is red/purple on bat+
To start Yellow/red on batt+
To kill: black/yellow on ground

Jul 29, 2017 | Boating

1 Answer

My outboard motor doesn't idle at low rpm's, it cuts off when put into gear.


Could be several reasons for this, poor quality / dirty gas, restricted fuel line either partially blocked or pinched at some point come straight to my mind.

May 02, 2017 | Cars & Trucks

1 Answer

Have a ingersoll rand air compressor, it starts right up but when release key it shuts off, will not stay running unless you hold the key to on possition


Hi dkurpius...
Sounds like a faulty key...
I would recommend you replace the key, that should solve your problem
Please take time to rate me

Sep 08, 2011 | Garden

1 Answer

My mercury 9.8 hp 110 starts but only stays running at half choke


Sounds like it needs a fuel pump kit, and possibly also a carby kit.

take photos as you are pulling the fuel pump or carby apart, or get a service manual for the outboard. The dealer might photocopy the pages you need if you ask nicely.

Jul 09, 2009 | Boating

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