You've have read about it on the forums, and here it is. An oversized O-Ring to replace Kawasaki PN 92055-1639. The factory sized O-Ring has been a known leak source for awhile.

MOB was taking care of the clan by selling these on the cheap, and if folks would send a buck and a self-addressed, stamped envelope they were on the way. We tried to keep the price down but for whatever reason, when we tried using the standard drop in the mail envelope with a stamp a whopping 20% never made the trip. SO... we now ship these in our standard bubble envelope USPS 1st Class with tracking.

Two for $6, which of course includes the shipping.

Thanks to MOB!