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Re: The old A has it in for me

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charlie M

10-31-2012 11:49:08

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Couple of thoughts to add to the others - do you have a good flow of gas if you disconnect the carb. Old tanks can have stuff plug up the outlet to the tank. Steel gas lines can corrode making too small an opening for a good flow. Also - does the tractor smoke. When its running rough does opening the choke part way help. If you have a manifold leak a partial choke will make it run better but will also make it smoke. Also are the plugs fowling after it runs for awhile. Just some thoughts.

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10-31-2012 12:03:53

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 Re: The old A has it in for me in reply to charlie M, 10-31-2012 11:49:08  
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I just replaced the strainer/bowl unit and that didn't help. I blew the line out last time I had it off (when I replaced the fuel strainer). It seems like a good flow.

It doesn't smoke and it doesn't seem to fouling any plugs BUT I don't run it all that long so I'm not so sure if that means a ton. I did try to run it with partial choke and couldn't find any place that really helped. That being said if I had to guess I would say it's running more lean then rich, it hasn't back fired or anything but it's not smokey that I can see.


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10-31-2012 13:53:55

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 Re: The old A has it in for me in reply to kopeck, 10-31-2012 12:03:53  
You said: "It seems like a good flow.".
How did you observe that? I'd remove the drain plug from the carb bowl and collect the gas in a container. Measure the amount after letting the gas flow for 15 minutes; should be at least a gallon. That amount may be regarded as "being available" to the jets. So, if the flow from the drain plug from the carb bowl is sufficient, the problem of lean running could be in the jets.
Other thoughts:
1) Is the venturi mounted properly?
2) Is there sufficient vacuum? Remove the pipe plug from the manifold (just above the flange to which the carb mounts) and screw a barb fitting in. Attach a transparent U-tube and fill with water. I must confess that I do not know how much vacuum it should register, but you could take this measurement form your B (or others may chime in...).
HTH, Hendrik

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