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Old 08-11-2015, 08:22 PM   #1
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Mariner/Mercury Bogging issue

Hello All

I have just purchased a 150ho mariner/mercury outboard approx. 1990.
I bought the engine knowing it had this fault with the intention of breaking it for parts.
However once I took off the scruffy scratched clamshell. The engine is fantastically clean and looks like its have very little use.
Shame to break.

I was told the engine starts and runs fine in a barrel or on muffs ,put it in the sea and under load it will not rev....
Any ideas , ive tested the compression and all are around the 122-127 mark.
If its an easy fix I may keep it and fit to my boat, if not it will sadly be dismantled for parts..
Cheers Peter
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Old 09-11-2015, 12:07 AM   #2
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Country: Ireland
Location: Dublin
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Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin

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Do the basics first..
Timing, synchronize and linkages, check spark on all 6, clean carbs etc.
Failing that its likely a stator..
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Old 09-11-2015, 12:14 AM   #3
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Sounds like it's not firing on every cyl, check for spark, plugs then coils
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Old 09-11-2015, 09:21 AM   #4
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Country: Uk
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Quote:
Originally Posted by 776peters View Post
Hello All

I have just purchased a 150ho mariner/mercury outboard approx. 1990.
I bought the engine knowing it had this fault with the intention of breaking it for parts.
However once I took off the scruffy scratched clamshell. The engine is fantastically clean and looks like its have very little use.
Shame to break.

I was told the engine starts and runs fine in a barrel or on muffs ,put it in the sea and under load it will not rev....
Any ideas , ive tested the compression and all are around the 122-127 mark.
If its an easy fix I may keep it and fit to my boat, if not it will sadly be dismantled for parts..
Cheers Peter
Is that the one that was on eBay yesterday with bogging down issues in Ashington ?
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