Honda F220 Owner's Manual page 41

Throttle cable adjustment
Measure the free play at the lever tip.
Free play: 10–15 mm (0.4–0.6 in)
If the free play is incorrect, loosen the lock nut and turn the adjusting
nut in or out as required.
After adjusting the free play, tighten the lock nut firmly.
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THROTTLE CONTROL
LEVER
10–15 mm
(0.4–0.6 in)
LOCK NUT
ADJUSTING NUT