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Was riding up Elk river close to 57 mph, then ski lost propulsion, let off throttle, it idled fine. but when you advanced throttle, it makes a hollow sound and vibration, idled it back to boat ramp. When I googled the problem, first thing that came up, was a one way check valve. I looked at impeller front and back, the housing has some wear, few nicks on blades. No check engine light.