1969 Ford F-250 calibrate carburator

Hi there,

The jets will be a fixed size, you can adjust the idle mixture but first you have to ensure that the carby is in good condition, with no excessive wear in the throttle valve and no vacuum leaks anywhere, also the float height will need to checked, best to get a manual for this engine as it will give you detailed instructions on doing this tricky set & adjustment, if OK, turn the mixture screw in till it runs rough, then slowly turn out till it evens out, keep going till it runs rough, then back till it evens out, this is best mixture with out any test gear, set idle as required, but first ensure all tune items are OK, carby settings are the last thing on a tune up, also best ensure that all comps are OK, as if not you will be wasting your time trying to do the tune.

Mark (mhpautos)