i HAVE A MERC 950 KIEKHAEFER SERIAL #2016735,THUNDERBOLT 6 CYLINDER.I NEED TO KNOW THE YEAR IT WAS MADE AND HOW OFTEN SHOULD THE POINTS AND CONDENSER BE CHANGED.THE ENGINE STARTS,BUT AFTER A WHILE WHEN YOU WANT TO OPEN THE ENGINE UP IT BOGGS DOWN.ALSO HOW OFTEN SHOULD THE FUEL PUMP DIAPHRAMS BE...