Jim---The manual that said to "raise the piston(s) 1/4 inch at idle to
check the mixture" is incorrect. Properly adjusted needles can only be
raised about 1/16" before faltering. In a pinch. these needles can be
adjusted with a long 1/8 inch Allen wrench. To lessen distress at the
carb diaphragms while making the adjustment with an Allen wrench, take
off the top of the carb and remove the damper, along with the needle.
You can then see the needle go up or down with the turn of the Allen,
and take a measurement. For a starting place, have both needles even
with the bottom of the air piston. The needle will only go so far up
towards "rich" before you'll run out of adjustment. Most engines respond
well long before you reach this (rich) mixture.
Dick T.
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