351 running rough

are the air/fuel screws working right? if you close them all the way the engine stumbles?

kapla wrote: where´s 79nautique? he is the one for this tail chasing threads!

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.

Bri892001 wrote: There's a piece inside the bowl that's replaceable, right? The needle and seat I think.

You are right, I didnt replace that on the rebuild either.

There's a piece inside the bowl that's replaceable, right? The needle and seat I think.

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.

maybe, Ill run it and take some videos/pics tonight and post for a diagnosis.

Jllogan wrote: ... ...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.

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.

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.

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.