check your chain tension regularly.. after it is retensioned and a week or 2 riding....if the tension is bad again
it is really very bad...basket case already.
conventional wisdom..a chain can only be retension 3 times.
anyway..check for chain wear...pull chain away from the rear sprockect ..if it can move ..3mm is my std for chain replacement...
if its more...accident going to happen if chain breaks.