The ignition timing is controled by the flywheel in relation to the core of the ignition unit and the key way in the crankshaft, so if the key in the flywheel has Shepard then the saw will kick back, if the key is ok then you can increase the air gap between the coil and the flywheel magnets to 0.5 mm, this may help.
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The ignition timing is controled by the flywheel in relation to the core of the ignition unit and the key way in the crankshaft, so if the key in the flywheel has Shepard then the saw will kick back, if the key is ok then you can increase the air gap between the coil and the flywheel magnets to 0.5 mm, this may help.