351 running rough |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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are the air/fuel screws working right? if you close them all the way the engine stumbles?
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<a href="">1992 ski nautique
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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FU##ing FUNNY
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<a href="">1992 ski nautique
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Yeah, he is missed He had a lot of good knowledge. He may have insulted the heck out of you while he was explaining something to you, but at least he would explain it. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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where´s 79nautique? he is the one for this tail chasing threads!
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<a href="">1992 ski nautique
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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You are right, I didnt replace that on the rebuild either. |
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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yes the adjustment is like you say. or at least it was at the beginning of the year. |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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There's a piece inside the bowl that's replaceable, right? The needle and seat I think.
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skyway2k
Senior Member Joined: June-24-2010 Location: Lake Gage, IN Status: Offline Points: 130 |
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When you have the float bowls off the carb and held in your hand upside-down, are the floats sitting parallel with the bowl top? This is a quick check to see if you have a good starting point for the float level.
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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not the idle adjustment screws on the bowl but the throttle idle screw.
I have the new plastic floats which are supposed to be bulletproof so I never changed them. |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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I know the floats can be replaced. They sell a new plastic kind that I've seen on Skidim. It says the old ones can become poruous, fill with fuel and not "float" as well.
Floats and power-valves (and maybe other things) can cause fuel leakage like that. Not sure how the idle adjustment would affect it. |
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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maybe, Ill run it and take some videos/pics tonight and post for a diagnosis.
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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do you think the floats should be rebuilt too? I didnt rebuild those the first time.
I thought of another thing, When it first started running rough it was idleing at about 250 rpm, so I tightened the idle screw to compensate, that could be causing the pump to dump a bunch a fuel in. doesnt explain why they arent the same, but it could explain why its pumping some. |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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I think it's possible to see condensation around your carb barrels because the vacuum around that area causes the air to cool and any moisture can get dropped out. As far as one yet spurting a lot and the other just dripping. I don't think they're really supposed to be doing anything at all when at idle. The idle circuit, which discharges underneath the butterflies is supposed to take care of everything. Dripping might be possible, but I'd say spurting is definitely wrong. Of course, your accelerator pump should spurt, but only as you are revving the throttle, not when idling. Sounds like you could be due for a rebuild or replace on your carb. Not sure if water would cause the issue or not though. Not sure on the coil thing. |
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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Also I noticed I think my tach is innacurate for some reason. It wont go any lower than 1K even if i drop the idle way down. Sounds like under 500. Does that point to a coil issue? I may have put it on the wrong post, which side should the gray wire be on?
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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its just dirt. I have not been to the lake for over a month as the boat hasnt been running right. That was after idling in the garage for 10 minutes.
What do you think about the different amounts of fuel coming out of the sprayers? This carb was rebuilt 50 hours ago and ran fine. I have been running out of a gas can straight into the fuel pump. I am trying to get it running right before I go through the trouble of draining the fuel tank etc. What about the coil, if it was going bad would it run rough (miss) and backfire? I thought the ballast resistor was supposed to reduce voltage but I am getting 12 volts on either side of it. |
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skyway2k
Senior Member Joined: June-24-2010 Location: Lake Gage, IN Status: Offline Points: 130 |
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It does look like water to me, but were you running the boat drivin around on the lake or just idling? Your secondaries would have never opened just running in place and not under a load. Probably condensed some water on the plates after the engine warmed up.
Have you looked at your water separator? Is it full of water? Maybe you should try completely draining out whatever gas you have in the tank and put in fresh if there's a lot of water. Also, your secondary barrels; are those cracks in the barrels? Or just casting marks that have picked up some dirt? |
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Jllogan
Platinum Member Joined: May-18-2011 Location: canton, OH Status: Offline Points: 1728 |
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Previous Thread
Ok so my engine is still running rough no improvement and I have narrowed it down a little. I think the timing/distributor is checking out, I have either replaced or checked everything I could and it says its in time. The only thing I havent checked is the coil as I am not sure what to look for. I think the whole issue may have been and still is water in the carb. I ran about 4 gallons of clean gas with seafoam through it and no improvement. I took these pictures last night right after running. It looks like water is still condensated in the secondary throttle plates. What do you guys think I should do? Does that look like water to anyone else? Also the jet by my thumb in the one picture is putting out a solid stream while at an idle and the jet on the other side is just dripping. Could water cause that issue? or has the water created other problems. |
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