HONDA metro 21 - Manual (Page 16)

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3.1.2 Blade Control Bail:
Located on the upper handle as shown in Figure 1. When the blade control bail
is depressed, the system senses that the operator is in the normal operator's
position.
For units with a Blade Brake Clutch: When the blade control bail is released, the
system senses that the operator has moved from the normal operating position
and will stop the blade.
For units without a Blade Brake Clutch: When the blade control bail is released,
the system senses that the operator has moved from the normal operating position
and will kill the engine.
FIGURE 1
3.1.3 Self-Propel Drive Bail (For Self-Propelled units only):
Located on the upper handle as shown in Figure 1. When the self-propel drive
bail is squeezed, the unit will move forward at the speed set on the speed control
lever. When this bail is released the unit will stop moving.
3.1.4 Throttle-Choke Control:
The throttle-choke control is located on the left side of the handles as shown in
Figure 1. The lever is used to control engine speed. Moving the lever to the full
forward
(Choke) position will place the lever in the choke position. The choke
aids in starting a cold engine. Moving the throttle control forward will increase
engine speed and moving it to the rear will decrease engine speed.
For units with a Blade Brake Control: The throttle-choke control also includes an
engine kill position. Moving the lever into the full rearward (Off) position will kill
the engine.
3.1.5 Blade Control Lever (Blade Brake Clutch Units Only):
The blade control lever is located on the right side of the handle next to the Blade
Control Bail as shown in Figure 1. Moving the blade control lever into the full
forward position while depressing the blade control bail engages the blade.
Releasing the blade control bail automatically disengages the blades.
3.1.6 Ground Speed (Shifter) Control (Self-Propelled Units Only):
The ground speed control is located at the rear of the belt cover as shown in
Figure 2. The ground speed control has three settings which control the ground
speed of the mower. 1 is slow, 2 is medium, and 3 is fast.