Question about kawasaki GPZ 500 S - GPX 500 R Motorcycles

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Hi i got a kawasaki 1986 gpz 400 ( fx400) fairingless it's normally called a grey import. my problem is that the waterpump at the bottom leak when the bike is warm, but if it's cold there seem to be no leaking, could a person take off the cover and sealed it, my understanding is that you don't get replacement parts, as it is a complete unit that you need to buy

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Kawasaki's are notorious for the waterpump seals going. There are little rubber doughnut seals (3 if i remember) that run along the impellor shaft. When these break down, you get the leak. I would be pretty certain on a bike of this age, that this is your problem. It isnt a massive job to do, but if your not technically minded it can get messy. The shaft is connected by a circlip on the opposite side to pump prop, and should, i emphisise the word SHOULD slide out, once the clip is released. But beware as ALOT of these become siezed and stuck fast, so some more dissasembly may be required. You can try taking off the cover and using a good instant gasket, providing that your running temp is fine, no water in the oil (if your lucky) but these cover seals are designed to pop if there is too much pressure behind them, hence me telling you about the impellor seals.

Hope this helps mate,

Mista B.

Posted on Apr 07, 2011

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