If the engine has never been apart, it will have plastic gears. The steel gear was an upgrade/replacement.
FYI- I have replaced just the broken plastic parts without doing any other valve train pieces and seen no ill effects. Did 4-5 of these when I was a technician. Didn't take long, just make sure to keep it clean!
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122-Curently in pieces with a cracked frame. Will live very soon!
Fathers - 106 w/ QA36, blade, 38" deck
1211 w/ 44" deck and blade
O w/ non-trip blade
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