Reprinted from Turning Wheels Nov 79
    Reprinted from the April 77 Washington Dictator

If you're tired of pouring so much gas through your Lark or Hawk, with a Carter
 AFB carburator, try some leaner metering rods and jets..  They'll cost you less
 than $6.00 (1979), so you can afford to try them.

I've been experimenting with some different combinations and have found some so
 lean that they put the needle on my exhaust analyzer over to the lean side of the meter.
 The combination that works best and seems to be the most readily available is:
 Metering rod - Carter part # 16-544
Primary jets - Carter part  #120-392
Secondary jets - Carter part  #120-377

If you find these too lean, then try  the same jets with the stock metering rods
 #16-99

I've found that the #16-544 metering rods work fine on trips and in the summertime,
 but they are a little lean for every day driving .  The engine seems to hesitate 
at low speeds and gasps a little when you accelerate hard.  I've gotten over 20 MPG
 with my Lark and an overall average of around 16 MPG
  Ingvar Vik