Motor Shuts Off While Running

ftroop82

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Jan 3, 2012
Messages
11
I have a 2005 60hp Mercury 2-stroke that just recently as I was under way at full throttle, just shut off as if I turned the switch, it cranks right back up and runs find until I get full throttle for awhile then shuts off again, cranks back up and no more issues the rest of the day, until the next time out, same situation again, then all is well the rest of the day. Any suggestions.
 

eavega

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Apr 29, 2008
Messages
1,377
Re: Motor Shuts Off While Running

Sudden shut offs with no slowing down or hesitating first usually points to electrical issue. Specifically something grounds out and causes you to lose spark. Is there any rhyme or reason as to when it happens? Rough water, trimming, etc? Tough to diagnose if the problem is intermittent and can't be reliably reproduced.

Rgds
 

CharlieB

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Apr 10, 2007
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5,617
Re: Motor Shuts Off While Running

Shutting off a couple of times when first run leads me to ask how warm is the motor when this occurs?

If the motor isn't up to full temp then a 'cold' motor requires more fuel to carry a load. This cannot happen with a fixed jet carb, the motor can cough or sneeze and die.

Proper warm up on a carbed motor is also important to prevent a 'cold sieze' condition, where the piston temp rises quicker than the rest of the motor, expanding , or attempting to expand larger than the still relatively cooler cyls, and the piston 'sticks'.

No Wake areas are great in that the operator has to run the motor at very low throttle and light loads which give the motor plenty of warm up time before putting the hammer down.

Try to give the motor a few more minutes of just off idle in gear before going to full throttle to see if this cures your problem.

If not, pay close attention to exactly how it dies, does it shut off very abruptly, as if the key is turned off suddenly?

Does the motor 'cough' or 'sneeze as it dies?

Does the motor slow for a moment before it dies?

The symptoms are helpful in determining if you are having a fuel or ignition problem.

Repost with more information as you get it.
 

ftroop82

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Jan 3, 2012
Messages
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Re: Motor Shuts Off While Running

I have been having some ignition issues with the key not springing back after I start the engine and the starter stays engaged in which I have to turn the key back a little to disengage the starter, but that is sporadic. The issues do seem to happen on rough days, now that you bring that up. I'll start by replacing the ignition switch and see if that solves the problem.

Thanks
 

ftroop82

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Jan 3, 2012
Messages
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Re: Motor Shuts Off While Running

Well it's back at it, I have a 2005 Mercury 60hp 2-stroke 3 cyl. outboard that cranks and runs fine at idle or low rpms but when I increase throttle and boat to plane it stalls and shuts off, then is very hard to crank, if it cranks at all. I have replaced all fuel filters, hoses, bulb and drained the carbs and sprayed carb cleaner. All this still had no effect, it still stalls. I'm at a loss here.
 

CharlieB

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Apr 10, 2007
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5,617
Re: Motor Shuts Off While Running

How hot is the motor? Can you hold your hand on it for more than a second? How strong is the P stream? How old is the water pump impeller?
 

ftroop82

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Joined
Jan 3, 2012
Messages
11
Re: Motor Shuts Off While Running

2005 Mercury 60hp Number 1, 2, & 3 cylinders 120, 50, & 30 compression. Motor fried. Always had oil in reservoir and never run hot, that I know of, always had a strong water stream from back of motor, water pump impeller two years old. Any idea of rebuild cost?
 
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