stihl ms391

I have an M390.. couple guess.. safety bar??? Clean your filter?? can you pull the chain around the bar smoothly??
 
You didn't say if the saw had been running or has set for awhie. Have you checked anything like filters, plug ,wires, does it have spark, is it getting fuel ( check spark plug to see if spark plug is wet or dry).
 
I didnt explain everything. i had a 20 inch bar on it and i put a 25 on and it wouldnt start.i put the 20 back on and it started
 

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