wc running rough
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=15065
Printed Date: 03 Feb 2025 at 7:44pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: wc running rough
Posted By: alan-nj
Subject: wc running rough
Date Posted: 12 Jul 2010 at 8:56am
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the wc that i'm putting together is running rough. i've got a rebuilt marvel 464 carb on it. it will only run smooth when the choke is only about 1/3 open. when i open the choke wider, engine runs rough. i adjusted the power jet, helped a little. adjusting the timing with the mag also helps, but i'm at the end of adjustment with the mag, can't go any further. checked for intake manifold leaks, can't seem to find any. looking for ideas....alan
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Replies:
Posted By: Dave(inMA)
Date Posted: 12 Jul 2010 at 11:08am
So it's hunting for gas.... Maybe still some dirt in the carb, or something obstructing the fuel flow to the carb?
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WC, CA, D14, WD45
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Posted By: Gerald J.
Date Posted: 12 Jul 2010 at 11:33am
Idle it down, open the choke, adjust the idle mix screw, then run it fast and adjust the power just, repeat a few times. you have to override the governor for the fine parts of these adjustments because it will compensate and hide changes otherwise. Or you watch the throttle arm and adjust for minimum throttle.
With a rebuilt carb, one wouldn't expect fuel path clogs in the carburetor or air leaks at the throttle shaft but they are possible. Check for good fuel flow with the float bowl drain plug removed. It should be the size of a pencil. Fuel lines that old can be nearly closed with varnish, as can the inlet adapter screen on the carburetor. Check the float level again.
Gerald J.
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