interchange between Kraft .61 and RJL K.61. We found some
older version back covers may shrink slightly over a period
of 10+ years depending on fuel additives used by some manufacturers.
This will cause the O-ring seal to be ineffective and cause
erratic performance. Replace entire back cover if you have
Carburetors have been basically the same throughout production.
The only change has been to the barrel and throttle arm. This
latest design will fit all earlier versions.
Kraft carburetors used 3 different needle valves. The first
Kraft carburetors used shiny nickel plated needles, black
needles and needles with brass knobs. They all have different
threads so be sure and order the right ones. Idle and main
needles will match in color.