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How to Install a Jet Ski Impeller: DIY Guide | PWCParts.com Your jet ski's impeller is the heart of its propulsion system — a rotating blade assembly inside the jet pump that converts engine power into thrust. When it's worn, chipped, or the wrong pitch for your riding style, you lose speed, acceleration, and fuel efficiency. The good news? Swapping an impeller is one of the most rewarding D …