The most reasonably priced component used on the C50l Little Cub 2000 (y) Japan is the O Ring, 30.8m/m.
Parts such as the : Gasket Cyln.head (nas), O-ring,27x2.0, Seal,vlv Stem, Packing,rub.16m/m are included in the C50l Little Cub 2000 (y) Japan parts fiche.
In this schematic the "Seal,vlv Stem" is used most often.