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I have an 04 CRF450r with about 30 hours. My seal just started leaking. I had planned to replace the seal and use the 06 impeller with the pressure release hole. The leak seems to be a known issue caused by pressure build up. With that being said, and the fact I have low hours, I am hoping not to pull the right crank cover to replace bushings ,oil seal and shaft. Anyone with similar experience and would like to share their opinions, its would be appreciated.

Its an easy fix. I replaced both seals on my 03 and it hasn't leaked in 40 hours. I later bought the new shaft and updated impeller thinking the new seals would only be a tempory fix but so far so good.