Question about Ford F-250
try adjusting slow speed valve........
Start by screwing the slow speed adjustment screw just until it seats gently, then back it out 1-1/2 turns.
Start engine and set the rpms to where it just stays running. Turn valve in increments of 1/8 turn, giving the engine a few seconds to respond. As you turn the valve in, the rpms will increase. Each time, Lower the rpms again to where the engine will just stay running.
Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.
When you have finished the above adjustment, you will have no reason to adjust it again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
Posted on Aug 07, 2009
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Posted on Jan 02, 2017
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