YZ450 Water Pump

2 replies to this topic
  • Perkins Racing57

Posted July 30, 2008 - 07:09 PM


On my 2004 Yz450 the water pump is damaged and needs to be replaced with a new water pump, Also Gaskets and seals. I was just wondering is it a pretty difficult to change the water pump. Im not sure if i can do it. Will I be better off taking it to a certified Yamaha mechanic.

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  • grayracer513

Posted July 30, 2008 - 07:25 PM


It involves removing the right side crankcase cover (the whole thing), draining coolant, oil, etc. Look at it in the manual and decide if it's over your head or not.

  • PatrickM

Posted July 30, 2008 - 11:32 PM


Its a pretty easy process....

The right side crank case needs to come off then you can replace the seals, the bearing, and the water pump shaft....

I would make sure you change everything since you are down there. I made the mistake of just replacing the seals and not the shaft and bearing and about 6 months later, the water pump started to leak again...

If you go thru the Thumpertalk OEM store, it should not cost you more that $75 (the impellor may add another $40)

Make sure you look thru the service manuel (if you have one), it shows the entire process very well.

Good Luck!!!!

Patrick M.

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