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engine missing/rough idle

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85sn View Drop Down
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    Posted: June-24-2007 at 12:18am
While running our '85 nautique at 2500 rpms, you can here a missing. When you idle down, running slow, black smoke comes out. When you put it in neutral, it dies. As we took it back to the dock, it started running just fine again and lasted 3-4 hours before missing again. We trailored it and towed it home. We hooked it up to the hose and ran it here, it worked just fine?? Any suggestions?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote racintj Quote  Post ReplyReply Direct Link To This Post Posted: June-24-2007 at 1:14am
Black smoke = too rich. Trash in carb, power valve blown, etc. Maybe time for carb rebuild. Some of the other guys can chime in that are pros with the carbs. But I definitely know that the black smoke is most likely too rich.
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spe123 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote spe123 Quote  Post ReplyReply Direct Link To This Post Posted: June-24-2007 at 5:16am
My '85 was rough at the end of last summer. After 21years of trouble free boating with just basic maintainence it was time to give her some attention. After reading the forum, I rebuilt the carb and installed an electronic ignition (new distributor, coil, wires, plugs). These two things have transformed the motor. No more pumping the throttle on startup or rought idle even when cold. Combined with a new prop, exhaust hose replacement, and some work on the cooling system and even my wife said the engine ran as smooth as the GT-40 EFI in the Sport (not quite). You might try some simple work on the carb and ignition system yourself before having anyone else take a look.
1985 Nautique2001 w/Chevy 454
2001 Sport Nautique
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85sn View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 85sn Quote  Post ReplyReply Direct Link To This Post Posted: June-24-2007 at 1:29pm
Thanks for the suggestions!

According to receipts from the previous owner, the carb was already rebuilt 3 years ago??? Now what?

Electronic ignition? How hard is the install?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: June-25-2007 at 10:09am
85, From the black smoke you have described, my suggestion is to rebuid the carb first and then look at the EI if required.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: June-25-2007 at 12:33pm
Three years means nothing, they can get crapped up in five minutes.
"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

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