Tight Angles, You never said if This problem has been corrected or not, but just for future reference smallenginewarehouse.com has the 25hp Kohler listed from $1500 - $1825 depending on which configuration you need. There prices are the lowest I've found anywhere in the country. Hope you were able to fix the problem without a new engine! Also a lot of hydros have set screws where the forward/reverse drive rod bracket attaches to the hydro pump, if these screws are not tight you will lose forward or reverse power. check them... I do know of one local dealer who tried selling a new hydro pump to an unsuspecting new hydro owner, and all he needed to do was tighten one of these 4 screws!!