Posted by Bob M on January 10, 2011 at 13:48:08 from (67.240.171.41):
In Reply to: Farmall M Rough Idle posted by Jim R on January 10, 2011 at 13:11:54:
Jim - A well-tuned M should idle smoothly down to 400 RPM and even lower - ie. delightfully slow(!)
Keep in mind the carb idle MIXTURE jet screw does just that. You adjust it to where the engine runs smoothest at idle. You then adjust the idle RPM using the idle STOP screw, then go back and tweak the idle MIXTURE screw again if necessary to give the smoothest idle.
Now if turning the idle screw out (CCW) to the point it does not lower the idle RPMs and idle RPMs are still too high, it could be there's a vacuum leak between the carb and manifold flange or between the manifold and the head. More likely however is the governor to carb throttle shaft linkage is not properly synchronized. You'll need to re-synchronize it in order to achieve a nice, slow idle.
Do a search on this forum for a detailed Farmall H/M carb synchronizing procedure - it's been posted several times here.
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