Hey Guys, Yesterday morning I took a 45 mile trip from my house to Murfreesboro Tn to pick up a new hustler Super Z. I have owned a Super Z with a 27 hp Kohler for several years, and have been very disappointed with the hill climbing abilities of the machine. So I was really struggling with the decision on whether to get the 31 hp Kawasaki or the 37 hp. I knew the 31 hp would be more powerful than the 27 hp was, but I also knew that most of the power would be consumed with the extra weight of the machine, and possibly by the new pumps. I had already told the dealer that I was coming after the 37 hp machine, but was second guessing myself on the way down to pick it up. I decided to call him about 20 minutes before I was going to be there, I told him what I had read on here about the 37 hp engines, and my concerns. I ask him to see which engine number was on the mower and the build date. When I arrived at the dealership the salesman had some pretty interesting information to pass along to me. First off he hadn't heard anything about the engine failures, so the first thing he did was call Kawasaki. This is what he was told. First off there are two bulletins coming out on the engine neither of which had this dealership received as of yesterday. One is on the cams and the other is on the heads. It turns out that the machine I was going to look at, had a engine build date of 11/10 or November 2010. This engine already has the new cams, but will still need both heads replaced under the recall bulletin. It seems that the metal in the cams was much too soft, and this was part of the problem. They also said that something was wrong with the metal in the heads. I guess both of these issues together was the cause of valve train failures. I bought the Kawasaki super oil that extended the engine warranty to 5 years, loaded that monster 37 hp up and brought it home. I work in the auto industry, and I know from time to time that issues do arrive that cause poor quality. I also know that any major company that has quality issues will dig in real deep real quick to correct the issues. Most of the time they don't admit they have a problem until they have a solution to fix it figured out. Hustler has had pump and deck issues now they have fixed them, Kawasaki has had engine problems, and now they are fixing them .... I hope ... lol going out to mow some hills, and will give some feed back on performance. soon. PJ over at the hustler forum should be able to find more info on the Kawasaki engine bulletins. If my salesman can I know he can also.