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i have a lawn mower, when i pull the cord it pulls my hand back

This type of kick back is usually caused from the engine timing being off.It is usually a sign of a bent or sheared key between the flywheel and the crankshaft. Remove the upper cover of the engine. Remove the starter cup from the top of the flywheel. Remove the nut on top of the flywheel and check the alignment of the groove in the flywheel with the groove in the crankshaft. If these grooves are not perfectly aligned, the key is bent or sheared. Remove the flywheel to replace the key. But make sure that you follow the directions for your mower, I just gave some general ones. Hope this helps. Good luck

when you order key, you may order flywheel puller

Mine does the same when you pull it but the key way is in tacked and not broke can someone help