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Hi Fred:
Hmmmmm.
- Confirm there is power in the plug.
- use continuity meter to check that there is a complete circuit through the saw.
- broken connection in plug?
- broken wire between plug and switch?
- switch not functioning?
- switch set between forward and reverse?
- Speed control potentiometer contacts dirty?
- Bad brushes?
this sure sounds as if it's an overheating problem , this causes the ign ckt to over heat and shut off the spark at the plug , id get a real good look at the cooling fins and make double sure theres no sawdust or other stuff in there blocking up the works , if you continue to run saw to overheat eventually it will damage the ign ckt to the point it wont come back on and saw wont run ,Period.
I use strong compressed air to blow out stuff stuck down in the ribs of saws(wear glasses )
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