2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 180Get this manual
COOLING SYSTEM Remove the right crankcase cover ('04'05: page 13-5, After '05: page 14-5)Remove the impeller and washer from the water pump shaftRemove the water pump shaft from the right crankcase coverSHAFT
MECHANICAL SEAL REPLACEMENT
Remove the water pump shaft bearing using the special toolsTOOLS: Bearing remover set, 12 mmRemover head, 12 mmRemover shaft Remover weight (not available in U.S.A) U.S.A only: Bearing remover, 12 mm Remover handle Remover weight Remove the oil seal07936-1660101 07936-1660110 07936-1660120 07741-0010201