Hi Rice, welcome to Outdoorking.
There are two likely causes of starter-kickback with that engine. By far the more common one, is that you do not have sufficient rotational inertia attached to the crankshaft. Normally this happens because someone is trying to start the engine without a proper blade or blade plate installed on the crankshaft, or it is installed loosely so it is not rigidly a part of the crankshaft. The other, less common cause is that a sheared flywheel key has resulted in the flywheel being stuck in a position a few degrees clockwise from where it would be if the key were not sheared.
