James, is there spark, fuel and is the choke staying on properly.
If it is trying to fire it could be a weak plug, stale fuel, dirty carburetor, or clogged exhaust screen in muffler, worn out low compression.
No spark with new plug, faulty switch, faulty coil. faulty plug wire, dirty weak magnets on flywheel.
Check the attached links,instruction and guides, Good luck
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chainsaw troubleshooting woodland forum at permies
Chainsaw Won Start
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