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Dorothyjack:
It sounds as though your magneto has gone out of timing. Between the flywheel and the drive shaft there is a small square key that keeps the flywheel from slipping on the driveshaft. The spark coming from the magneto is not causing the spark plug to fire at the exact time it is supposed to. You will need to remove the side cover from the motor, and check to see if the slot in the flywheel and the slot in the driveshaft (where the square key fits) are aligned exactly. if those two slots are not aligned (even a little bit) the saw's engine timing is off. This is caused by the chain being stopped suddenly while you are cutting (for instance if the chain pops off of the chain bar. it will be necessary to remove the flywheel (using a flywheel puller) and replace the key. then reassemble the saw making sure the chain tension is correct and that the magneto to flywheel spacing is correct.
so using a punch and hammer is NOT the correct way to remove the flywheel?
NO. You will break the flywheel. You need to remove the bolt and washer from the top of the driveshaft and use a gear puller to pull the flywheel off, then replace the key, reinstall the washer and bolt and torque the bolt down so the flywheel does not "slip on the shaft and shear the key.
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