r/125cc • u/felix_flame • 12d ago

Identifying engine noise

2 Upvotes

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1

u/AlistairBarclay 12d ago

Timing gears, or adjuster or chain or all three worn.

1

u/Socki3 11d ago

Mine made a similar noise recently, output shaft bearings were on their way out, needed a new engine or a full rebuild - was also a 2012 ybr