Re: Is my Muffler broke?
Easiest thing to do is use the non-fluted side of a drill (end that goes into the drill chuck) and check the fit on your jet. Once you find the drill that fits the jet orifice, solder the hole shut and redrill with the next smaller size number drill. Wrap the drill bit with duct tape and use your fingers if possible to re-drill the hole since solder is very soft.
I'm sure the other guys on here have another way of doing though that might be easier.
I have use JB Weld in place of solder and had great results.