Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 273Get this manual
2) Return the throttle grip to the fully close position and hold it in the position with the friction grip 3) Pushing the throttle arm lightly in the direction of arrow, check that the reference marks (2 places) on the throttle cam are at the left side to the center line of the roller when viewing the throttle cam from the front
121THROTTLE ARM
[3] MARKS (2 places)
[5] THROlTLE CAM
4) Adjust as follows, if necessary
1] SHIFT PIVOT
LOCK NUT
aLoosen the shift pivot lock nut, remove the mm lock pin and mm washers, and disconnect the shift cable from the throttle arm
bTurn the throttle grip to the fully open position and hold it in the position using the friction gripcPull the throttle cable lightly as showndWith the throttle arm lightly in contact with the fully open stopper, turn the shift pivot and adjust the throttle cable length so that the shift pivot can be set on the throttle arm smoothlyeTighten the lock nut securely5) After adjustment, turn the throttle grip from the fully open position to the fully close position and check the procedure from step to step again