I talked to the mechanic he told me he micd the pistons after tear down and found the pistons are to small. Thus allowing for the blow by. My Question is how many pistons were cast this way? Also has anybody had there engine rebuilt during warranty? Does Polaris warranty the rebuilt engine another 6 months? I'm thinking they should just put a new engine in my XP. Ranger build date: 12-06 Total hours: 27.Is this going to be a lemon after polaris rebuilds IT ?