Hangar 9 Assembly Manual page 34

Section 17: Checking the Throttle Operation
Throttle set to Idle
Move the throttle stick down to the fully closed position.
Move the trim lever upward to open the carburetor roughly
1/16-inch (1.5mm). This will be the idle position for
your engine. The idle will be fine-tuned at the field so the
engine will idle reliably without stalling for slow flight and
landing procedures.
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