Honda HP500H Manuel De L'utilisateur page 12

Throttle lever
The throttle lever controls engine speed from SLOW to FAST, it will stay
in any designated position.
Choke lever
The choke is used to provide proper starting mixture when the engine is
cold.
It can be opened and closed by operating the valve lever manually.
Move the lever to the CLOSED position to enrich the mixture.
CHOKE LEVER
SLOW
FAST
OPEN
CLOSED
THROTTLE LEVER
CLOSED
FAST
SLOW
OPEN
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