Honda FJ500 Owner's Manual page 27

OPERATION
Tilling Depth Adjustment
The drag bar is used to control the tilling depth.
The tilling depth adjustment can be made as follows :
Remove the lock pin and retainer, loosen the lock nut and bolt
securing the drag bar and sliding the drag bar up or down as
necessary.
After adjustment, tighten the bolt and lock nut securely.
Insert the retainer and set the lock pin.
During operation, if the machine jerks forward while tilling, press
down on the handlebars. This will cause the drag bar to dig more
deeply into the soil.
26
LOCK NUT
RETAINER
LOCK PIN
BOLT
DRAG BAR