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Discussion Starter #1
Idle issue:

I took the boat out yesterday (first time in about 1 year so it still had the old gas in it). The boat would not idle until i ran the boat for about 10-15 min around the lake. After beach the boat for an hour or two the boat would not idle again. I adjusted the idle screw on the carb and that did not work. Last time i had the boat out it ran perfect with no problems. Is this because of the old gas?

Battery issue:

I have 2 battery's (one for stereo and one for starting). Being as after we had beached the boat and listened to music the boat would not start (got it started by jumping) and yes i did turn the battery off. My thought is that when i first got the boat on the lake and not idling i had to continue to start the boat a bunch of times. By having to start so many times is that why the battery died?

Boat info: 20.5 Hardin open bow 454 BBC stock

Thank you for any help
 

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Could be the bad gas, clogged filters or even the floats in the carbs or some trash in the carbs, i had that problem and it was all of the above i just had to weed out and try all of them until it worked , thats called jet boat life my friend
 

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BANDAID DUDE!
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Is the boat fuel injected? Sounds like bad batteries or Alt. Not charging.
 

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Where to start?

1st off, drain the shitty gas out of it. Even adding "new" gas doesn't correct the VARNISH in the tank(s) and that shit will clog everything in the carburetor... The idle circuit is about the smallest passages in the carb, so it stands to reason they will clog and reduce the fuel flow. When the motor is warm it is more forgiving for A/F mixture. After sitting for a while the reduced fuel flow is too lean to idle as the "air" is not clogged/reduced..... Get the shitty gas out of it. Bad/old gas does all sorts of bad things all the way to the valves and new gas doesn't remove it.... The battery issue is quite likely bad/dirty connections unless they have been totally cleaned prior to bringing the boat out for the first time of the season.... If the connections are clean, go buy a battery, or two.....
Ray
PS the stereo in a boat should be at the end of the exhaust at WOT....
 

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use a BBC to pull a BBC
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PS the stereo in a boat should be at the end of the exhaust at WOT....

:))THumbsUp:))THumbsUp:))THumbsUp
 

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I'd bet you have dirty air bleeds for the idle circuit. Things like float levels and idle screw adjustments shouldn't change from sitting if the carb is clean. Gas these day's grows shit in a carb at an alarming rate. You could try to unscrew the air mixture screws from the side of the metering blocks and spray some carb clean into the passages. let it soak for a minute then blow through the passages with compressed air. If it still won't idle, you'll probably have to pull the carb and clean it thoroughly.

As far as your batteries, were they fully charged before you went out? Your alternator will only keep a battery charged, not recharge a dead battery. In a boat you normally don't run long enough to recharge a low or dead battery. I would charge them fully and then have them load tested. Also, make sure your alternator is charging.
 

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No excuse, sorry...

I agree but this is a day cruiser....
I'm sorry, but that is no excuse. ANY boat cruising down the river, or across the lake, should have a "song" going on out the back..... The ONLY excuse for a battery powered stereo in a boat involves a stripper pole and a full load of the "fairer sex" as passengers..:))THumbsUp

The info about the idle mixture screws is right on, and also check the 4 (8) little brass colored air bleeds just inside the choke horn. If they clog it will give you fits trying to set an idle. They are so small you'll need to use a few strands of electrical wire to clean them....Welding tip cleaners also work.... The most important thing is that shitty gas. When left sitting for any length of time the "light liquid" portion of the gas evaporates, leaving the heavy dark colored VARNISH. Severe varnishing actually dries in the bottom of the tank, and then "chunks" off leading some people to believe their fiberglass tanks are de-laminating because it has a look like dried resin... Then you add fresh gas that sort of dissolves the layer of varnish, but it acts like concentrated material and as it dissolves it pollutes the new gas... I've actually seen vacuum secondaries varnished shut, and a thick layer of varnish in the intake plenum, and of course the back sides of the intake valves and head ports.... I rebuilt a Holley in July of last year and had a chance to look at that same carb in late August, yep, all varnished up again because the same shitty gas was still in the tanks... I rebuilt the entire engine for the guy, but I'll likely have to do the carb again to clean the varnish out of it. The engine is here on the floor waiting for him, (2 months and counting, but it is paid for) to flush the tanks clean before we put any shitty gas into the now cleaned intake system.... I tried several cleansers on the aluminum intake with little success until I tried plain old GUMOUT "choke and carb cleaner", that stuff "cut" the varnish very quickly. I just had to keep it flowing until it ran all the way out of the runners.....
So, when will you have the stripper pole in???
Ray
 

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I am not going into the stereo issue! Also I agree with the bad gas theory but how it died out might point to another issue! Did it stumble and die or did it die right when you came off the peddle. Stuck floats will create alot of the issues you are having. You could also tell how it ran at cruise around speed, lazy bad throttle response and black smoke out the exhaust? I could go into how you shut the boat down before a long nap! Did you run it out of fuel or shut it down with the bowls full of fuel??? Mark
 

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Discussion Starter #12
the boat would die when I let off the foot peddle. When I was driving the boat it seemed to run fine. I got it to idle for a little once i ran it around the lake but once again after letting it sit for about an hour it wold not idle again.

As for the battery issue they were both fully charged before i went out. I checked the battery's last night and the starter battery (less than 1yr old) was showing 12.2 and the stereo battery was at 11.1.
 

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the boat would die when I let off the foot peddle. When I was driving the boat it seemed to run fine. I got it to idle for a little once i ran it around the lake but once again after letting it sit for about an hour it wold not idle again.

As for the battery issue they were both fully charged before i went out. I checked the battery's last night and the starter battery (less than 1yr old) was showing 12.2 and the stereo battery was at 11.1.
Okay, What ignition are running? Might have critters growing under the cap! condensation grows in places you cant imagine. I would pop the bowls of the carb and check under the cap for point gap and corrosion, if you are running a point distributor if not even the electronics grow fungus in the ignition if the batteries are left on or not disconnected! I would check these items before tossing a bunch of fuel. living on the coast with the ocean air! Fuel lives alot longer these days with all the crap added by your'e friends at the EPA. Good luck and let us know what you find! Mark
 

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Discussion Starter #14
Also I wanted to ask about a noise I hear in WOT.... It is a very high pitched (almost like a whistle) sound when I pull off the throttle. It has always made the noise I was just curious what makes it and if it is normal.
 

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The vacuum secondaries on my Holley carb will make a whistle (almost like a turbo's waste gate closing) when I back out of the throttle and the secondaries begin to close. Been that way since C&J rebuilt it. Only happens when they close. No issue for me.

CC
 

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The vacuum secondaries on my Holley carb will make a whistle (almost like a turbo's waste gate closing) when I back out of the throttle and the secondaries begin to close. Been that way since C&J rebuilt it. Only happens when they close. No issue for me.

CC
I was going to stay silent on the vac leak but seeing that it has been tossed in the fire here goes. most vac leaks will raise the idle and not kill a motor at throttle lift. They will normally make an engine hard to slow then die at cruise. I too have had many carbs whistle at decell and even idle. Can be alot of different factors that create the noise, air horn, butterflies, and scoop for that matter. Most common are the vac secondary models. A 3310 vac secondary is most famous for it! My 660's on the tunnel do it all the time on the lift of the peddle. I have feeling his problem has to do with stuck floats, ignition, or nasties in either or! Mark
 

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Okay, What ignition are running? Might have critters growing under the cap! condensation grows in places you cant imagine. I would pop the bowls of the carb and check under the cap for point gap and corrosion, if you are running a point distributor if not even the electronics grow fungus in the ignition if the batteries are left on or not disconnected! I would check these items before tossing a bunch of fuel. living on the coast with the ocean air! Fuel lives alot longer these days with all the crap added by your'e friends at the EPA. Good luck and let us know what you find! Mark
does the fuel last longer at the river?
 
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