There could be many reasons
Manufacturing flaw- missing or weak causing break
debris caught in chain causing breakage
corrosion causing breakage
person who put master link in screwed up on install on the bike
anywhooo.... replace the chain now!
Manufacturing flaw- missing or weak causing break
debris caught in chain causing breakage
corrosion causing breakage
person who put master link in screwed up on install on the bike
anywhooo.... replace the chain now!