Husqvarna Rider ProFlex 21 Operator's Manual page 24

4. If the engine is cold, the choke control shall be
moved backwards to its end position.
5. Turn the ignition key to the start position.
6. When the engine starts, immediately release the
ignition key so that it returns to the neutral
position.
IMPORTANT INFORMATION
Do not run the starter motor for more than
5 seconds at a time. If the engine does not start
wait about 15 seconds before trying again.
7. Move the choke lever gradually forward once the
engine has started.
DRIVING
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