This is a replacement set for most OS 4-cycle engines. Some people refer to
them as valve adjusting screws. This set contains 1 screw and 1 nut, but since
these engines require 2 screws, you may need to purchase 2 sets.
NMH 7-21-92
Updated JBM 12-28-05
This fits the FS-40, FS-61, FS-70, FS-90, FS120,
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