i took off the water pump cover on my 1986 cr 250 and discovered that the impeller wont come off. ive tried turnig it the wrong way and the right way. can someone please tell me how to get it off.
Remove the water pump cover, Now you will see the impeller and it has a little 10 mm(I think) nut fitting on it. Put the bike in gear and apply the rear brake. Now unscrew the impeller with a socket wrench. Take it easy as they are quite soft. Once that is off, you should be able to pry the seal out, and pop a new one in. A good way to get old seals out is to use a screw, screw it in to the seal then grab it with the pliers. You might want to replace the oil seal while you are there since they are so cheap. To do this though you will have to remove the rh crank case cover cause this seal sits in the inside of this cover. This is also an easy job. When you remove the rh crank case cover ( with impeller already removed) the water pump shaft should just slide out from the inside and give you easy access to both seals.
Adding to jon's answer - loosen the nut by turning it counter-clockwise.
