There is a set of grates on the intake of the jet pump on all jet skis. The size of the rock ****ed up will be limited depending on the space between the grates Usually only small gravel could be ****ed into the pump. Larger rocks will be filtered and kept out. Most of the time, only the impeller gets dinged up or bent & sometimes the blades get broken off. It must be replaced and the shaft should be checked to see if it is bent. If so, it must be replaced also.
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