Do you know if the spark plug has a spark?
If the spark plug is old, it would be a good idea to put in a new one. If the spark is weak, it could be that the flywheel magnet is rusty and need cleaning. Also check the spark plug wire for cracks in the rubber.
If there is a good spark...... next I would take the carburetor off and squirt carb cleaner in each hole and watch to be sure fluid comes out from the other end.
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