Take a close look at the impeller. Small dings, nicks, or too much wear between the blades and the housing can all cause cavitation. Check the clearance, which should be less than 0.5 mm. It eventually happens to all skis, but will happen faster if you ride where there is lots of sand or debris going through the pump.
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2008 Yamaha FX HO Cruiser
2010 Hurricane Sundeck 2100
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