Kohler OEM Drive sleeve 359448 for 5E/7.3E & 5ECD/7.3ECD Carbureted and Injected models - Do you have a black drive sleeve ? If so, change it to the new style at your next pump or impeller change - If the impeller is intact and the pump is OK, but the impeller is not spinning, IT IS MOST LIKELY A BAD DRIVE SLEEVE! (Black->Yellow->Green)