How do I start the engine on the T100 Lawn Tractor?
Insert the key into the ignition switch, place the PTO lever in the disengaged (OFF) position, engage the parking brake, and activate the choke control. Then turn the key clockwise to the START position and release it once the engine starts — do not hold the key in the START position for longer than 10 seconds, as this may damage the electric starter. After starting, deactivate the choke and place the throttle/choke control lever in the FAST position. (Page 18)
From the official Craftsman T100 Series Lawn Tractor manual, page 18
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