I have a 14hp Kawasaki engine and it is always going through spark plugs like candy. It is not used every single day but at least a couple times a week. I go to crank it and it won't start, the plug is fouled up really bad so I pop in a new one, then it runs just fine. My question is does anyone have any reason or suggestions as to what the problem is or what the problem could be? Any help would be appreciated.