autobatch

You can check the regulator with a voltmeter (it should be under about 14v I think) but that is probably not the problem. It is more likely from what you have said, that the spark plug is fouling. Look at the plug. If it is all black and sooty looking, it is running too rich. If it is idling too rich, just adjust the idle mixture screw (not the idle speed setting but the low speed mixture setting). You might simply try turning it in (clockwise) 1/2 turn. You may have to clean the plug or ...