Repairing a Cub Cadet XT1 Mower w/Kohler 7000 Series (KT725) Engine that is hard starting / hanging on compression. Customer reports mower is hard starting and pops a little when it does start, sometimes it also hangs on compression when trying to start. Already performed battery test on battery and found that it is reading at 12.97v at 123CCA out of 300CCA and battery tester suggest to replace battery; so replaced with new and now engine turns over most of the time but hangs on compression at times when attempting to start.