Question about 2003 Yamaha YZ 125

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2000 yz125 - Water pump seal change

My 00 yz125 was dripping coolant from the weep hole so i went out and bought the pump gasket and seal but i am stuck at the impeller wheel - do i need to take the entire casing off to get the impeller wheel off??? tried putting the bike in gear and holding the tire with no success...

Thank you

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  • deuscent Jul 01, 2009

    Thank you -

    We are talking about two layers of casing that needs to come off, right? First is the water pump and impeller wheel housing (top of diagram), then the second (bottom of diagram) which holds the kick-starter and everything else... that seems like the real difficult part!

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The two seals in the diagram below are separated by the casing they fit into. The impeller is threaded to screw onto the impeller shaft. I think you already knew that by your "holding the tire" note. The center casing does not get split. The right casing does remove then a wrench is used on the shaft as the impeller unscrews counter clockwise. It is risky to "Lock the wheel" because the gear on the impeller is very thin and can break.

A “very helpful” rating on this answer? Thanks!

2000 yz125 - Water pump seal change - b7780ac.gif

Posted on Jul 01, 2009

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