today I fixed the exhaust pipe and the derailed drive chain.
The weld at end of pipe inside the muffler to the end cap has failed and it fell off like this.
i saw the small pipe was originally pinched in the middle, which I thought it was not good for gas flow. So I cut that short:
and then put those back into the muffler in this arrangement:
I have riden the bike like this today, it sounded just a bit louder but I like the sound better now. It sounded firm.