Honda HRX217HMA Owner's Manual page 19

Rear Discharge
To discharge clippings to the
rear, remove the grass bag and
position the clip director knob in
the BAG range.
Maximum rear discharge will occur when the clip director knob is all
the way to the left (BAG) position. As the clip director knob is moved
toward the right (MULCH) position, less grass will be discharged
though the rear discharge guard.
BEFORE OPERATION
CLIP DIRECTOR
KNOB
17