Well started up the wr250 today and was going to ride it around the back yard a little.Everything seemed fine when I heard a strange sound. Not tearibly bad but diffrent. so I shut it off. i then noticed oil dripping pretty good. tjought drain plug had loosened up. Took skid plate off but that wasn't pt. i then noticed a hole on bottom of right crankcase cover under water pump.. Pulled it off and the impeller gear for water pump had broke in halve. . All crankcase bearings are fairly new as well as seals. No play or slop anywhwere. Is this a common accurance. I was going to replace cover and water pump, seals ect and be done. My question is should I be worried something else is wrong. Bike is not locked up and was running fine .It did not stop running but I shut it off as soon as I heard noise. Just wondering if the gear just broke?