I rebuilt my 12 jc pump this winter, we took it out this weekend and when you would take off the boat would feel like a slipping clutch, when it would catch and be fine. The more the load in the boat, or on the boat, or the more throttle the worse it is. The last time we took the boat out to tube it seemed to do it longer than normal so i put the boat on the trailer. Its a Taylor LP, mild 454, rock grate, aluminum A impeller. Any input would be appreciated.