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Tractor Talk Discussion Forum

heres one for you guys but why

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old

05-17-2006 14:07:26




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Got an old licoln portable welder. I went to start it today and it would only hit on one cylinder. Checked the plug that wasn't fireing and found it wet so I tried another plug. Didn't work, I figured I would pull that plug wire when it was running but when I tried that it would die. Tried useing the choke and that didn't help. Then I pulled the fuel line off and blew into it and got a better gas flow and it ran just fine. Now why didn't the choke help if it wasn't getting enough gas? And why did it die each time I tried to pull the one plug wire??
Thanks Just asking so I might have an idea of what was going on

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KEB

05-17-2006 19:18:53




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 Re: heres one for you guys but why in reply to old, 05-17-2006 14:07:26  
Choke question is easy. Closing the choke only pulls more gas out of the carburetor float bowl. Since the bowl is vented to the atmosphere, closing the choke has no effect on supplying gas to the float bowl. In this case, gravity couldn't quite keep up with enough flow to run both cylinders & it was probably running way lean from the level in the bowl being low.

This is a guess, since I'm not familiar with that engine. I'd suspect that the flow from the carburetor to the two cylinders isn't even. With it running real lean, the second cylinder was probably in fact firing, but wasn't getting enough of a charge to get hot.

Do you have one of these infared thermometers? It'd be really interesting to see if the exhaust on both cylinders is at the same temperature under load.

Keith

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Mark - IN.

05-17-2006 19:00:34




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 Re: heres one for you guys but why in reply to old, 05-17-2006 14:07:26  
Well Old, let me take a stab at it.

Choke only richens the fuel mixture by removing the air. You say that cleaning the fuel line resolved it, so it wasn"t getting enough fuel for the choke to work. I"m guessing by removing the plug wire making it run rougher or stopping, it must"ve been running lean, perhaps vapor, and by choking it, you removed the vapor to run on. The hole in my theory is that you say the muffler was cool, which is not a symptom of lean, but rich. So that blows my whole theory out of the water. I give up Old, you"d better send that thing to the lab for further investigation - you may"ve found the perfect and worlds most fuel efficient engine, that is until you fixed it. Them tree hugger guys sure are gonna hate you for that. LOL.

Mark

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BobReeves

05-17-2006 16:29:40




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 Re: heres one for you guys but why in reply to old, 05-17-2006 14:07:26  
Not sure about the welder but some two cylinder motorcycles I have owned used both ends of the coil, one end to each plug. Cylinders didn't fire at the same time but the cylinder that wasn't on the firing stroke didn't care if the plug fired.

Pull either plug wire and it won't run at all.



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Tim in Mohnton PA

05-17-2006 16:21:55




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 Re: heres one for you guys but why in reply to old, 05-17-2006 14:07:26  
If the gas wasn't getting to the carb, no amount of choking it can get more gas out of the carb since the gas isn't there. As for the one wire, I'd guess that it was taking every drop of gas to keep it running, so when you removed one wire and, in effect, stopped burning half the gas, it just couldn't keep going on one starved cylinder



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old

05-17-2006 17:15:31




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 Re: heres one for you guys but why in reply to Tim in Mohnton PA, 05-17-2006 16:21:55  
I would agree if that cylinder had been fireing but it wasn't. The muffler was so cold you could hold your hand on it as long as you liked.



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Coloken

05-17-2006 15:01:48




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 Re: heres one for you guys but why in reply to old, 05-17-2006 14:07:26  
Can't answer your question, but will say that I have seen some real strange things happen when a carburator/float was messing up.



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