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Dec 30th, 2023
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 2005 Mercury 50 hp 2-Stroke Oil Injected motor...weird bang
#12911221
09/25/18 02:33 AM
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Joined: Feb 2003
Posts: 450
Shifty
OP
Angler
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OP
Angler
Joined: Feb 2003
Posts: 450 |
Ok, this motor sat up for 4 years before I got it, and I bought it from the original owner.
I drained the gas tank as good as I could (leaving maybe 1/4 gallon of old fuel).
Changed plugs, rebuilt and cleaned all three carbs, and changed impeller.
Added Stabil (Marine mix), and Seafom, then put 5 gallons of 93 octane fuel.
Started the engine in the water (fired up within 1 second of turning the key.
Does not want to idle, have to give it mild throttle to keep it running (1100 RPM).
But here is the weird part...about every 5 seconds, its like someone hits the engine with a sledge hammer.
The engine will be idling and then *WHACK*, and it even makes the steering wheel jerk to the side.
Runs fine at anything above 1100 RPM, and actually runs great at full throttle.
Stays at about 6500 RPM at WOT.
Just cant fogure out why it wont idle below 1100 RPM (dies), or what that *BANG- WHACK* is every 5 or so seconds when at idle below 1200.
Any help would be appreciated.
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Re: 2005 Mercury 50 hp 2-Stroke Oil Injected motor...weird bang
[Re: Shifty]
#12912719
09/26/18 11:45 AM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
Idle circuits clogged up in the carbs. That whack is a lean cough.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: 2005 Mercury 50 hp 2-Stroke Oil Injected motor...weird bang
[Re: Shifty]
#12912749
09/26/18 12:11 PM
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Joined: Feb 2006
Posts: 913
Alumacraft 14
Pro Angler
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Pro Angler
Joined: Feb 2006
Posts: 913 |
Carb job time, hopefully last guy didn't mess with adjustments screw.
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Re: 2005 Mercury 50 hp 2-Stroke Oil Injected motor...weird bang
[Re: Shifty]
#12913290
09/26/18 07:18 PM
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Joined: Feb 2003
Posts: 450
Shifty
OP
Angler
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OP
Angler
Joined: Feb 2003
Posts: 450 |
I rebuilt the carbs before I ever tried to start it...I didnt mess with any of the adjustments...just took them off and rebuilt them then put them back on.
So they need adjustment?
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Re: 2005 Mercury 50 hp 2-Stroke Oil Injected motor...weird bang
[Re: Shifty]
#12914737
09/28/18 12:36 AM
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Joined: Feb 2003
Posts: 450
Shifty
OP
Angler
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OP
Angler
Joined: Feb 2003
Posts: 450 |
1/4 turn on the mixture screw and all is well...thanks guys.
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