HEAVY DUTY LEADED HIGH OUTPUT CAPACITOR, A DIRECT REPLACEMENT FOR THE OLD LUCAS 2MC CAPACITOR BUT HIGHER OUTPUT.  IF YOUR HARNESS HAS 2 FEMALE SPADE CONNECTORS ON THE HARNESS WHICH CONNECT TO THE NEGATIVE SIDE OF THE 2MC CAPACITOR YOU WOULD USE THIS UNIT TYPICALLY USED ON MK3 COMMANDO.  IF YOU ONLY HAVE THE ONE WIRE PLEASE USE 990737

THESE WERE INTRODUCED BY LUCAS TO AID THE STARTING AND RUNNING FOR BIKES WHICH WERE FITTED WITH ALTERNATORS TO RUN WITHOUT A BATTERY.

FOUND TO BE USEFUL ON ANY BIKE WITH OR WITHOUT A BATTERY AS IT ALLOWED STARTING WHEN THE BATTERY WAS FLAT AND GENERALLY GAVE EASIER STARTING AND SMOOTHER RUNNING.  FITTED AS STANDARD TO MOST BRITISH BIKES FROM THE LATE SIXTIES ON.

IT IS WORTH POINTING OUT THAT CAPACITORS DO NOT LAST FOREVER, IF YOU DO NOT KNOW HOW OLD YOURS IS OR IF YOURS IS THE OLD BLUE 2MC OR IF YOUR ALTERNATOR EQUIPPED BIKE DOES NOT HAVE A CAPACITOR THIS IS WELL WORTH FITTING

OUTSIDE DIAMETER: 35.2 MM

LENGTH OF THE CAPACITOR: 55.4

ALL "2MC" TYPE CAPACITORS ONLY HAVE TWO INPUTS, POSITIVE AND NEGATIVE HOWEVER ON SOME BIKES TWO WIRES GO TO THE NEGATIVE TERMINAL , THE ADDITIONAL NEGATIVE WIRE IS JUST CARRYING POWER ELSEWHERE , EFFECTIVELY USING THE CAPACITOR AS A JUNCTION BLOCK SOMETIMES THE EXTRA WIRE IS REDUNDANT AS IN THE EXTRA POLICE INTERPOL FLASHING LIGHT.  

PART NUMBER: 990737 HAS TWO SPADES

PART NUMBER: 990737MK3 IS IDENTICAL IN BOTH CASES.