Wrong spark plugs cause flooding?
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=23497
Printed Date: May-02-2024 at 7:38am
Topic: Wrong spark plugs cause flooding?
Posted By: cbr1000dude
Subject: Wrong spark plugs cause flooding?
Date Posted: September-13-2011 at 10:46pm
I just bought a 87 Ski Nautique about 4 weeks ago, and have been sorting it out. After fixing most everything (man some people don't take care of their boats), today I changed the spark plugs. It was hard to start (just turned over and over)after it was fully warmed up and sat for a while. It seemed to be flooding, as I could hold the throttle fully open, and it would start, die, then run fine.
The PO had installed Champion RV8C plugs. They are much different looking from the Autolite 24. Short, with a recessed tip. That means a cold plug to me, yes?
It needed an impeller (had pieces of the old one in the thermostat housing almost blocking it), so I'm wondering if he tried a colder plug
since it was running hot? I guess! Why else would you run such a cold plug?
Runs fine now!
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Replies:
Posted By: Nautiquehunter
Date Posted: September-14-2011 at 1:55am
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Spark plugs have no effect on engine temp. It sounds like you have a carb problem, float or power valve. I would put in the correct spark plug and overhaul the carb. Are you still running points? Make sure you check them if you are.
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Posted By: Bri892001
Date Posted: September-14-2011 at 12:54pm
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So putting in the correct plug totally fixed it then?
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Posted By: cbr1000dude
Date Posted: September-14-2011 at 11:23pm
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We'll see after I get the rest sorted out. It has a new carb that was just installed before I bought it. I'll try adjusting the idle and fuel/ air screws too. If it's like others I've seen, you adjust the mixture for best rpm, and lower it to idle at 600-700 rpm with the throttle stop screw. Sound right?
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Posted By: cbr1000dude
Date Posted: September-14-2011 at 11:25pm
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Oh, yes on points also, I will check them for gap and dwell.
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Posted By: Bri892001
Date Posted: September-15-2011 at 12:06pm
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I'd maybe look more at float level than idle/air screws etc. See if you getting any leakage out of the booster nozzles at idle or after shutdown.
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Posted By: cbr1000dude
Date Posted: September-15-2011 at 10:13pm
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I checked the idle screws, one was at 1 1/4 turns out, the other at 2 turns. I set them both at 1 1/2 turns per Holly's website. Seems to run and idle fine. No leakage visible after shutdown with the choke plate held open. Started right back up after 15 minutes.Hmm. Maybe the choke was sticking. I'll check that if it happens again.
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Posted By: Bri892001
Date Posted: September-16-2011 at 12:04pm
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Good to here it's running well. Also, good idea on double checking that the choke is opening when it should. If it stayed closed, that could cause flooding too, like you say.
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Posted By: cbr1000dude
Date Posted: September-20-2011 at 1:47pm
Just a quick update. The choke wasn't opening completely even when if was completely warmed up (160). It was only closed maybe 1/5 of the way, but when I turned the choke housing, I had to go all the way past the last lean mark before it opened all the way. Now it starts right back up with a touch of throttle very eagerly, and revs better too.
I'm not sure the electric warm up feature is working even though it gets 13 volts when running, but as long as it's starting and running great I'll leave it alone. Don't fix it if it ain't broke!
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