Originally Posted by pipewizard
If you bought it from a dealer, take it back and have them fix it. If not, find someone who can fix it.
This ^^^ is what I would do. Used bikes purchased from dealers are under limited warranty, usually 30 - 90 days.
If the bike was bought from a private seller 'as is' then no recourse on it.
Either way I would have it replaced unless the OP isn't planning to keep the bike long. If the OP resells it the OP should disclose the defect IMO.
Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .