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Merc 1994 225 Black Max any good?

Old 02-26-2012, 11:30 AM
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Default Merc 1994 225 Black Max any good?

I am looking at a grady with a 1994 Mercury Black max....225 on it. Most of the older Gradys that I see are powered by yamaha ox66........I am hesitant about this Black Max.....can anyone educate me on this engine. Dealer says less than 300 hours on engine. Is this a reliable engine?????
Thanks
Old 02-26-2012, 11:32 AM
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I wouldn't piss on one if it was on fire! But hey ...thats me
Old 02-26-2012, 05:10 PM
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Now thats a strong statement. This is the kind of info I need to know. Can you expand on that? Did you have a bad experience with Mercury?
Old 02-26-2012, 05:36 PM
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You really can´t consider any 94 engine to be reliable anymore, no matter which brand, I mean, after 18 years in the marine environment. And about the statement "less than 300 hours" really? less than 17 hours per year? I wouldn´t trust that and even if it´s real, sometimes items gets more damaged for the lack of use, rather than a normal use. Just my .02
Old 02-26-2012, 05:41 PM
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In their day they were fine, but my word, she's in her twilight now.
Old 02-26-2012, 06:06 PM
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Originally Posted by jpv View Post
Now thats a strong statement. This is the kind of info I need to know. Can you expand on that? Did you have a bad experience with Mercury?

I just don't like them. Every one I have ever owned has given me problems....more then average. I just don't ever care to own another.
Old 02-26-2012, 06:29 PM
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I just got rid of a 1993 175 black max, 2.5L V6. Not identical but most of the below applies. I hope I never see one again.

The Good:
Durable if they are adjusted to run rich
Simple to repair/maintain
Parts are easily available and cheap
The large cloud of smoke keeps the bugs away
Powerful

The Bad:
A motor that sounds like a broken coffee grinder doesn't inspire confidence when you're far from land.
The loudest outboard I've ever experienced, from idle all the way to WOT.
The smelliest outboard I've ever experienced, especially when it's cold out
Starting one is an art form... scary when you're drifting towards a bridge.
Old 02-28-2012, 04:45 AM
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Default mercury 225

I raced hydrostream boats in the 1980s and into the 90s The old chrome bore 200 and 225 motors were the best built outboards in the world. I turned them 7500 rpm with electric fuel pumps even though mercury said they would not turn them above the 6800 rated max. I wish I could find a freshwater low hours one to put on my new boat. I have a 2011 with a 4 stroke yamaha and have had trouble with fuel containing 2 micron particles clogging up the fuel system. That old merc would blow that dirty fuel right through and keep on gettin it. This new motor is already a problem with 60 hours on it. Yes they were dirty and smoked at idle but I will bet a millon bucks nothing made today will outlast them.

Last edited by fireman199259; 02-28-2012 at 04:46 AM. Reason: spelling
Old 02-28-2012, 04:54 AM
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I had a boat with twin 1993 175 hp Mercs--not Black Maxs though. I boat her with an estimated 1200 hours, and ran her for about 7 years. At that point, I figured she ahd about 2000 hours. Sold her, and then saw her in a boatyard getting repowered about 5 years later. The boatyard guys said she still ran fine and that another guy had bought the motors to use on his boat. The owner had just gotten tired of the noise and smoke.

For me, I'll take noise, and smoke (only bad on cold start), because it came with reliability and longevity. Who knows after 17 years.
Old 02-28-2012, 05:15 AM
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Friend had one and ran fine until the plastic gear in the oil injection system broke and he blew the motor and found out after this was common and others recommended mixing the oil and gas just in case you buy it .
Old 02-28-2012, 05:31 AM
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have you done a compression test?
if not,,,do one on all cylinders first..it should read 110 - 120 lbs per cylinder
damn good motors,,, balz to spare and yes sound like a cement mixer
after you do the compression test and it's good run it and see how it is,,,sea trial ect,,, from there we can go over de-carbing and tuning it,,,
any and all boats and motors at some point had there bad eggs so to speak,,,there's a reason why this one is still around,,,like mine
best of luck!!!!
Old 02-28-2012, 06:35 AM
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Had one that was reliable once it got started, but that was often a long, drawn out process. And that was in 1995. I wouldn't want one now.
Old 02-28-2012, 05:15 PM
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Default mercury 225

Mercury stopped making the chrome bore sometime in the 1990s but check with the guys in WI. to be sure of the dates The motor I ran was not oil injected. Yes the nylon gear in the injection pump was a major problem but the first years of injected motors had a steel gear. Mercury went back to the steel gear very quickly because they learned steel good plastic bad. Again check with the guys in WI they will tell you if yous is a chrome bore motor and if the gear was nylon or steel in that year. If its not a chrome bore I would not want it. The oil pump gear is an easy swap. Only the 200 and early 225 were chrome bore motors the 135 150 and 175 had a steel bore and were not as durable.
Old 02-28-2012, 07:43 PM
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many thanks for all of the replies. cant beat THT!

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