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87BFN owner 
Grand Poobah 
Joined: August-25-2006 Location: Saline, MI Status: Offline Points: 2194 |
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 Topic: Black sootPosted: July-28-2007 at 8:46pm |
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Your 90 should be running an autolite plug, I believe. I am not sure if that motorcraft number cross refferences to the autolite plug or not.
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BSteele
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Joined: May-31-2007 Location: United States Status: Offline Points: 9 |
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Posted: July-28-2007 at 8:39pm |
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Allright guys.
I pulled the #1 plug and found minor black crbon build up on the plug. I am using a motorcraft ASF 42C. Could this be the wrong spark plug for my 1990 Nautique. Maybe this plug does not burn hot enough. If this is the correct plug, where is the adjustment on the carb to lean it out a bit? (351w) Any help would be appreciated. |
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BSteele
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87BFN owner
Grand Poobah
Joined: August-25-2006 Location: Saline, MI Status: Offline Points: 2194 |
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Posted: July-27-2007 at 8:22pm |
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Check your exhaust hose for water output while running... If your not getting enough water your hose could be getting hot and burning.. Mostlikely your just running a little rich but check it anyway to be safe.
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BSteele
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Posted: July-27-2007 at 4:00pm |
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Yes, the tow vehicle is a diesle but that is not where it is coming from. It's only on the back of the boat. I will pull the plugs and get back to you guys. Running rich is a definite possibility. A little carbon is normal but mine seems excessive.
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BSteele
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: July-27-2007 at 3:03pm |
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Billy, Is your tow vehicle a diesel??? No, it does sound like the boat is running rich. It si probably time for some carb work.
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bmiller
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Joined: June-05-2006 Location: United States Status: Offline Points: 234 |
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Posted: July-27-2007 at 2:41pm |
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Not to sound stupid is it only there when your trailering the boat?I'm assumming its from after a day of running and you see it when you are putting it but on the trailer.My boat does that also,but only a little.Its just a little carbon build-up.If its excessive and really black,then it sounds like your running rich.If thats the case have you checked your plugs to see how there burning?If they have alot of carbon build-up and are black you need to adjust the carb.
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BSteele
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Joined: May-31-2007 Location: United States Status: Offline Points: 9 |
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Posted: July-27-2007 at 12:40pm |
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I am finding black soot under my swim platform after trailering the boat. I do have some white smoke/steam during operation of the boat. I have new plugs, new oil and great oil pressure. The boat runs like it's new. Is this normal? Any ideas? 1990 Ski Nautique.
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BSteele
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