1. Decompression switch stuck?
2. Muffler plugged or worn out?
3. safty bar switch stuck?...but your getting spark...hhhmm
Can't be overheated and piston siezed...because you can pull the cord to get a spark...hhhmmm.....thats all I got...Good Luck
Gonna have to get a Stihl! J/k,
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