Hi sawain1, I guess it all depends on the position of the piston when the machine was inundated..... ie. if the piston was covering the ports, possibly no water got to the bottom end, so the bearings would be fine. Have you noticed any unusual noises or knocking on idle? Re the rough running...have you replaced the starter 'O' ring?
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member. Kindest Regards, Darryl