Normally when they run good to the first spot and are then hard to start or keep running it is loading up from unburned fuel. Try a new set of sparkplugs. Double check make sure your motor has the correct plugs in it.
ï¿½The world will not be destroyed by those who do evil, but by those who watch them without doing anythingï¿½ Remember what He has done and remember that He is not done yet! GOD IS GOOD