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Old 05-15-2019, 06:47 PM   #1
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Default Rich motors

My 2000 33’ maxum has 5.7 lt merc crusers the previous owner said that he had both carbs that are two barrell rebuilt but i doibt they were jetted probably at least thatscwhat im thinking both running rich any thoughts as what could be wrong starts off with black smoke then a slick of fuel immited anyone come across something like this or have any sugestions thanks
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Old 05-16-2019, 01:36 AM   #2
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Check that the chokes open completely.
That would be the first place to look.
Does it stop smoking after warming up?
Don
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Old 05-16-2019, 01:46 AM   #3
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Not completely and you can see gas in the water
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Old 05-16-2019, 02:01 AM   #4
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Thanks for the reply don any other thoughts
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Old 05-16-2019, 02:03 AM   #5
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Don i believe the carbs were rebuilt while out of the water is it possible that they were not jetted properly and that could be the reason for the rich mixture
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Old 05-16-2019, 02:31 AM   #6
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As Don said the choke may not be opening fully, remove the flame arrestor and verify the plate is fully open after a few minutes of starting them up.

Could be jetting or improper adjustment of the air fuel screws.
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Old 05-16-2019, 03:16 AM   #7
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Thanks for the input greatly appreciated i will check and pass on info thanks again
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Old 05-16-2019, 06:42 PM   #8
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+1 on what Mike said.
Don
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Old 05-16-2019, 10:26 PM   #9
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Its obvious who ever rebuilt the carbs did not set them right had a buddy come by had them both reagusted within 20 min. Thanks guys for the input
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Old 05-16-2019, 10:29 PM   #10
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On to my next order problem my port side shifter will not shift. When i first put it in the water it shifted but was very stiff now it wont shift forward will shift in reverse but will not go forward did not want to force the issue any ideas. Apparentley previous owner said that he had replaced the **** cable is it possible used wrong cables
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Old 05-16-2019, 10:31 PM   #11
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Oh yes don the choke was not opening properly and they had to be adjusted thanks again
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Old 05-17-2019, 01:48 AM   #12
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Quote:
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On to my next order problem my port side shifter will not shift. When i first put it in the water it shifted but was very stiff now it wont shift forward will shift in reverse but will not go forward did not want to force the issue any ideas. Apparentley previous owner said that he had replaced the **** cable is it possible used wrong cables
The cable may not be adjusted properly. First try disconnecting it at the engine end where it attaches to the shift plate. Does it now go into forward ok? If so reattach it and disconnect the lower shift cable from the shift plate? Still shift ok?
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Old 05-17-2019, 02:26 AM   #13
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I believe we tried that when not connected shifts good but when reconnect wont shift
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Old 05-17-2019, 02:40 AM   #14
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Ok when top cable off shifts good but when bottom cable off top on wont shift
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Old 05-17-2019, 02:45 AM   #15
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Lower cable sounds like it is bad, need to replace.
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Old 05-17-2019, 08:50 AM   #16
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Ok thanks for the imput
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Old 05-17-2019, 11:03 AM   #17
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Quote:
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Ok when top cable off shifts good but when bottom cable off top on wont shift
If I recall the top cable is the one going to the helm control therefore if it shifts ok when disconnected but not when connected and the lower cable is disconnected then the cable not adjusted properly. Go to Documents of this site to get the Mercruiser manual for your drive and follow the instructions on how to adjust the cables. Note there is a tool for this.

Also with the lower disconnected and the engine running by pushing and pulling on the cables end the drive should shift into forward and reverse.
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