are these pic still viewable somewhere ???This is a little step-by-step on how to replace the waterpump seals on the YFZ450.
Part #'s first:
Large oil seal~93102-11008-00
Small oil seal~93102-12106-00 (SD-12-22-5-HS)
Side case gasket~5TA-15462-00-00
If you smell anti-freeze or see anti-freeze around the frame or the skid plate on the right side of the quad (sitting on it) more then likely the seals for the waterpump need to be replaced and the impeller is scored which caused the seals to fail.
Location of the waterpump.
You must remove the engine oil and drain the anti-freeze at least out of the waterpump housing....you don't need to drain the entire cooling system.
You must also remove the upper and lower oil lines in order to remove the side case.
First, remove the waterpump cover, oil filter cover, oil filter and upper and lower oil lines. Be careful, there's a small o-ring on the lower oil line and make sure it's reinstalled when you put everything back together.
Remove the side case that houses the impeller, oil seals and bearing.
Just a pic of what the motor looks like with the side case removed.
Remove the impeller and inspect the impeller shaft for "grooves". Replace as necessary. To remove the oil seals pry the outer one out with a screwdriver. Removing the bearing is probably the most difficult part of the job. I tapped it out from the outside in using a screwdriver and then pryed the inner seal out.
Use some lithium grease on the seals when reassembling everything and when the seals get reinstalled....the springs face AWAY from each other or basically the springs are in the fluid...oil and anti-freeze.
Torque everything back to specification according to the service manual.