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there are a few thing this could be i have had the exact same problem with my js 300 i have sloved mine with a new head gasket angetting the barrell skimmed but the other things are impeller to pump housing clearance a blocked inlet (take off pipe and blow through to check) or damaged impeller hope this helps

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15y ago
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Q: Your JS 300 Jet Ski is not pumping water and over heating?
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