Question about 2004 Yamaha YZ 250

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On my 99 yz 250 I have coolant leaking from the hole right behind the waterpump housing on the bottom side of the case. I just replaced the base gasket is there anyway coolant got down there and its just residual coolant thats leaking? Or do I need to change the two seals on the impeller shaft?

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Replace water pump seal and shaft

Posted on Aug 04, 2010

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Hi mate this will be the oil & water seals the leak from weep hole is basically a warning light to tell you it needs replacing asap, you need to remove impellor, carefull not to lose the spacer washer behind it...then remove the water seal clean the surface it came from and replace with new seal. Now to do this 100% I would always replace the impeller shaft as the shaft wearing is usually what caused the seal to fail and I would also replace the oil seal which is the other side of case that you just changed the water seal (oil seal sits behind the small bearing) I would also consider replacing this bearing but maybe not critical? all up the impellor shaft the 2 seals and bearing last time I bought cost about $160... no special tools required just quite a bit of time required as you should really remove the outer engine case to access the impellor to undo it and to get to the oil seal and bearing, how ever I know guys do just open the water pump cover then rattle gun off the impellor only replace the water seal then install the impellor and cover back on then ride away! this will work and will fix the leak but is definitely the incorrect way to repair this and will be temporary fix but thought you may like to know this alternative as is very handy way to do it if your on a race meeting and just need to get through the last race or two.

hope this help cheers... Moto X Parts online.com

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2004 YZ 250 is leaking fluid out of the hole just behind water pump underneath the crankcase. The gasket looks fine and its not leaking from the gasket its actually coming out of the hole. I started...


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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My water pump is leaking coolant from the bottom.


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Apr 12, 2010 | 2004 Yamaha YZ 250

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2003 yz impeller seal is leaking, do i need to replaice head gaskets thanks ian


I am not sure what you mean by impeller seal so here are a few scenarios:

**Note: Based on YZ250. others may be similar.

-If the gasket around the impeller housing is leaking you can replace that on its own. Open rad cap, drain the coolant using the lower screw with the copper washer behind it. Then remove the other 3 bolts, remove cover, clean mating surface, install new gasket, snug everything up, and replace the coolant.

You don't need to replace the head gaskets unless your leaking from there, or getting coolant in the engine.

The same would apply to your base gasket.

just in case:

-if your transmission/gear oil is milky, your will have to change the oil seals on the impeller shaft.


Jul 17, 2009 | 2003 Yamaha YZ 250

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