Has any one had a similar problem? My friend has a 04 Mini Z with the 19 HP Kawasaki Motor. After about ten minutes of mowing on his first yard the mower starts spuddering and then stalls out. It is then very hard to get restarted. Once you get it running again it runs fine. Being that he cannot make it happen for the dealer they cannot find the problem. He has replaced the Spark Plugs, Fuel Filter, And Air Filter is clean. Only has 120 Hours. Any help Would Be Appreciated! Thanks.