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RMZ250 - Waterpump Spins Freely by Hand and doesnt rotate with kickstart

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As title, I currently have a 2007 RMZ250 and recentely I had to take off the cover that exposes the water pump impeller. When I took off the cover I noticed that I can freely rotate that impeller by hand and when I tried rotating the engine with the kickstart the impeller didnt budge. Should the impeller move freely by hand, shouldnt it be directly connected to a gear on the crank? The bike has overheated before and hasnt been driven in a while.

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No-it should not move freely. It is ran off a gear from clutch basket,to oil pump to water pump. Either the threads are stripped,gear is not matching or shaft snapped. You will need to examine. There are some YouTube bids on how to rebuod water pump. You will see how it goes together,how to take impellar of and make repair.

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