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Running Issue

Old 08-10-2020, 07:40 AM
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Boat starts runs fine. Idle out of canal fine gets on plane runs great. Run along 3800 rpm perfect. As soon as I let off at all starts breaking up. Then continues the bog worse and worse. At idle barely run. Leave it for 20 mins starts up runs fine again for a while then same issue. Changed seperator and in-line filter no better. Holley 750 double pumper I知 thinking loading up?
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Old 08-10-2020, 09:37 AM
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Float valve in carb not sealing ??
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Old 08-10-2020, 09:48 AM
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Have you checked your spark plugs to see if you are getting excess fuel? Could also be you coil over heating, had that on my boat, did the exact same thing.
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Old 08-10-2020, 10:36 AM
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Originally Posted by ThisIsLivin View Post
Have you checked your spark plugs to see if you are getting excess fuel? Could also be you coil over heating, had that on my boat, did the exact same thing.

its weird bc I知 not seeing any heavy smoke or smelling excess gas. I値l swap coil cheap enough
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Old 08-10-2020, 10:40 AM
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The first hiccup I had was around 4K was getting a little miss. I thought I was hitting bottom just little shutter. Let off then ran like ****
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Old 08-11-2020, 10:35 AM
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Originally Posted by ThisIsLivin View Post
Have you checked your spark plugs to see if you are getting excess fuel? Could also be you coil over heating, had that on my boat, did the exact same thing.

I have the Mallory electronic ignition and a super stock coil. I looked it up, the ignition requires min 1.5ohm. The super stock is 1.4ohm. I ordered a new coil fingers crossed it痴 overheating. Boat runs absolutely perfect then acts up. Limped to trailer ramp on 4cylinders lol. Got home started it to flush it ran perfect.
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Old 08-11-2020, 12:26 PM
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May not be the issue but a very similar thing happens when the fuel tank vent is blocked .
To eliminate that possibility loosen off the fill cap and try running it as you do when the problem presents itself.
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Old 08-11-2020, 04:46 PM
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Originally Posted by madbouyz View Post
May not be the issue but a very similar thing happens when the fuel tank vent is blocked .
To eliminate that possibility loosen off the fill cap and try running it as you do when the problem presents itself.
Thats exactly what I was going to do next time out. After it acted up, I opened cap tried listening for sucking air but was windy. Weird bc cruised at 3400rpm for a couple miles no issues. Soon as I pulled back just 200rpm it started acting up and got worse.
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Old 08-11-2020, 05:43 PM
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Looks like I知 loading up on the primaries



Last edited by 21eagle; 08-11-2020 at 06:06 PM.
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Old 08-11-2020, 06:13 PM
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Has me thinking I知 fine when running on secondaries, let off a little and acts up. Primary side of carb all black
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