I just had a not so good experience with a 23hp kawasaki engine that i bought that was called "Brand new". The engine was the right one for the mower and it was new but it was several years old. I sent the engine back. This is what i would like to know. I have done research but cannot find anything on the bolt pattern for kawa's. I am looking at a kawa 20hp which is much cheaper brand new with a 3 year warranty. (Kawasaki 20 HP - FS600V-AS04-R) I read that pretty much all the kawas in the 20-25hp range have the same base. Can someone please help me?