I have a 064 runs great until I shut it off when I crank it back over it'll run for a second then turn off then won't start this saw is old my father has had it a long time hell its older then me lol I did a compression test and it still has 160psi took the muffler off piston looks great so the only I could think of is maybe the coil getting hot since they are known for crappy coils?