In case anyone is interested, here are the weights (in ounces) of most of the Brodak engine, complete with needle valve and glow plug.

   Engine            Weight       Weight with muffler
   B-40                6.8            8.5
   B-25                5.4            7.2
   B-15                4.4            5.6
   B-049/061 MKI   1.6           1.8

 I weighed them with a digital type postal scale which seems quite accurate.

      Bob Z.