Stripped exhaust bolts??

[jamezgreen]

Hello, new to the forum and new to the GZ250 world. Seem to have come across my first dilemma. Noticed the exhaust got progressively louder on my way home from work yesterday. Took a peak when I got home to find one of the bolts missing off one of the 2 exhaust tubes where they connect to the engine (sorry if I'm not using the correct technical terms!) So, bought and put in a replacement bolt and it fell out the next day. They seem to tighten up but loosen up rather quickly as soon as I start the bike and the louder exhuast hasn't gone away, even with the bolts tight, since the original inciddent Are my threads stripped? What are my options? Could I use a tap larger threads and use bigger bolts? Or maybe I just need new gaskets? Any help would be appreciated. Thanks.