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Jan 23rd, 2013
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Help Mercury Black Max bogs down #13456749 03/01/20 09:37 PM
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Benny55 Offline OP
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I have a 1985 Mercury Black Max 150 HP that bogs down when i give it throttle.I drove it around the lake twice , was head back in when it turn off .Turn it on and it started to bog down . I had the same problem 2013 and had the carburetor and diaphragm rebuilt and work fine .It start up fine with the flusher earmuff but at the lake it will bog down when i give it throttle . I have put new spark plugs , diaphragm , stator and tigger . What could be causing this it to bog down ?

Re: Help Mercury Black Max bogs down [Re: Benny55] #13456767 03/01/20 09:58 PM
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T Bird Online Content
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Due to the motors age the first thing I would check is compression.

How old is the fuel supply hose and primer bulb?

What is the age of gas in your fuel tank? Is gas treated with conditioner?

When was last time fuel filter was changed?


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Re: Help Mercury Black Max bogs down [Re: Benny55] #13456827 03/01/20 10:58 PM
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FishFishin Offline
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I agree with Tbird.. Trash in carb.. gotta figure out how it got there flehan

Re: Help Mercury Black Max bogs down [Re: Benny55] #13457416 03/02/20 03:13 PM
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boatman025 Offline
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Carbs and check value got need replaced also


Hughes Marine
3855 Osage Lane
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Re: Help Mercury Black Max bogs down [Re: Benny55] #13460075 03/04/20 05:16 PM
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Fishin' Nut Online Content
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Clogged fuel lines from ethanol gas. I had the exact same issue. Idles just fine, dies at throttle up.




Kirk Long (Kikr) March 4, 1959 - June 19, 2009
I guess the Lord needed a fishing buddy more than me.
Re: Help Mercury Black Max bogs down [Re: Benny55] #13460173 03/04/20 06:42 PM
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Stump jumper Online Content
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I had a 1985 175 Black Max and went through this from time to time. Always the carbs. I replaced all of my fuel lines with ethanol resistant ones. Replace needles and seats and clean the carbs. I probably replaced mine 5 or 6 times over 30 years I owned it. Once I got bad ones. Drove my mechanic nuts trying to figure it out. I had one mechanic tell me to remove the plugs on the bottom of the bowls and spray it out with Berryman,s. Mine had red thread sealer on them so I never tried it. Check your floats for leaks. I had one with a pin hole one once. Also make sure your floats are adjusted correctly. A high float or 2 will cause the motor to bog.


2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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