KX Riders
Maintenance & Technical => KX500 Original => Topic started by: wreck-n-roll rik on May 03, 2009, 10:20:51 AM
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Went for a ride today adn the bike dumped all the coolant out. When I got back home and gave it a good check, it appears that the water pump is not working. When I pulled the pump cover and spun it by hand it did not feel like there was a gear on the back side of the shaft. How hard are the pumps to rebuild and does anyone have instructions listed some place? Any good places toorder from?
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You need to buy yourself a service manual first. I'm going off memory here but I think the water pump shaft itself had a gear made on the end of it and that was driven by a plastic gear (I'm not sure)?? The plastic gear I'm thinking of might be the one for the power valve actuator. You'll need to remove the clutch side cover to get a better look at. The impeller is just bolted to the water pump shaft.
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The pump rebuild is easy. ABEC7 bearings, you can use skateboard ones or I got some super quality ones from a bearing shop for $2 each. The seal you have to get from a dealer. Get a pump cover gasket while you are at it. The small bearing in the main case is a little interresting to get out but when you get there post and I will post a pic of the puller I made out of an old bolt. Cam.