87 Mercury 150hp BlackMax full throttle bogging down and dying - East Tennessee Fishing

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Old 03-31-2012, 10:14 AM   #1 (permalink)
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hey guys, I just bought am 87 Bass Tracker with a 150hp Mercury Black Max and it ran GREAT on Wednesday when I test drove it for an hour out on the lake. Bought it Friday afternoon and dropped it in the water. Started right up no problems running up the river just a few mins, then put it to full throttle and the motor bogged down and died. Then had to wait a few mins started it again, a little rough running and then poof done the same thing again. waited got it started and ran at 1/3 power back to the dock and it ran a little rough



I NEED HELP!!! This is the first boat I have owned, other then canoes and kayaks, but what could cause this problem and suggestion on how to fix.



I personally think new fuel with treatment, plugs, fuel filter, new 2cycle oil, air filter, clean out carb and look at the distributer.....



HELP
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Old 03-31-2012, 11:34 AM   #2 (permalink)
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If it ran great for an hour before you bought it and brought it home, it's probably something simple. Check your fuel line and tank vent and make sure your plug wires are all connected.
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Old 03-31-2012, 02:18 PM   #3 (permalink)
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Prior to addressing the items you mentioned, I would change the fuel lines and bulb to the new ethanol resistant parts. Keep in mind that if your engine is starving for fuel, it is also starving for lubrication. Bad things can happen quickly if this issue isn't corrected. If you don't know when the lower unit fluid and water pump were changed, you also need to add that to your list. Hope you get it straightened out quickly.
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Old 04-01-2012, 04:42 AM   #4 (permalink)
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I think your on the right track im having the same problem out of my 60hp I called a boat repair shop the other day about it and was told to clean the carbs with some gumout or sea foam but dont squirt alot and it should run like new every where i call say its carbs Hope this help and good fishing
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Old 04-01-2012, 08:51 AM   #5 (permalink)
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I am really hoping it just the carb and bad fuel... but I have had several people tell me that it was the water pump. I am not sure how to check that. Any clues????
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Old 04-01-2012, 11:53 AM   #6 (permalink)
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I guess anything is possible, but it's not likely a bad water pump would cause the problem you are having. You should have a strong stream of water coming out of the water outlet hole at the back of your motor (just below the cowl) when it's running. If you have no water coming out of the outlet or see steam coming out of it, then your water pump impeller needs replacing before you run the motor again.
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Old 04-01-2012, 12:25 PM   #7 (permalink)
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congrats on the purchase as others have mentioned i would start at the fuel tank and clean and replace lines bulb and filters the good news is you know it runs well now just time to fix the lil gremlins that live inside our boats
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Old 04-01-2012, 12:47 PM   #8 (permalink)
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Quote:
Originally Posted by Larry McDavid View Post
I guess anything is possible, but it's not likely a bad water pump would cause the problem you are having. You should have a strong stream of water coming out of the water outlet hole at the back of your motor (just below the cowl) when it's running. If you have no water coming out of the outlet or see steam coming out of it, then your water pump impeller needs replacing before you run the motor again.
Agree that the water pump is probably not the cause of the loss of power issue the gentleman is having. The water pump and lower unit fluid should be changed once a year or 100 hours. If you are not VERY familiar with this motor's service history, I would get these items addressed before I ran it very much. Spending this relatively small amount of money up front will save big $$'s if a major failure can be prevented.
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Old 04-01-2012, 07:35 PM   #9 (permalink)
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I really hope I didn't do any damage to the pistons to loose compression and screw anything up... what should be an acceptable compression. I am spending g my day off doing the impeller, fuel filter, sea foam, Carb cleaner, air filter and all that jazz tomorrow. I hope to have an update tomorrow afternoon.
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Old 04-01-2012, 09:24 PM   #10 (permalink)
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with sea foam just do a squirt squirt method in each carb if you just spray it in you may burn a cylinder so just real quick squirt squirt
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