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i have a 05 kk 900 and the past couple of months i put a vanamburg tunnel and his u coolers. put the motor in and filled the water put about a 1gal in started it and no circulaton look at thermostat it was open lean it in every direction added a little more water but still no circulation. so pulled motor back out to look a water pump and impeller is good and the shaft will turn when you turn the crank. but dont know how those pumps work what the spring for behind the impeller? heard that you need a seal kit and a special tool and you should be up and running agian?