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 REPLACED?ALSO IS IT HARD TO REPLACE THE STEERING LINKAGE,AND HOW DO I GO ABOUT THIS.ANY HELP WOULD BE APPRECIATED.