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I have a 1998 yamaha yz 125. Gut did a top end rebuild. All works fine, but leaking coolant thru the weep hole just under the inpeller cover. What is going on here?
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The hole is a weep hole, designed to drain coolant from water pump seal leakage or oil from bearing seal leakage from contaminating either system. So one of the seals is leaking, and you should rebuild the pump.
Looking at the parts diagram it appears the impeller is threaded onto the shaft on the YZ250....hope that helps, heres the parts diagram http://www.mrcycles.com/fiche_section_detail.asp?section=50188&category=Motorcycles&make=YAMAHA&year=2004&fveh=1236
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