inside the megaphone

[goggleboy]

I'm a backyard Joe trying to make this 78' Gs750 run, ran out of ideas.
I cleaned the carbs following bikecliffs site, rebuilt the petcock ()
put valve clearances in spec, sealed air box, new boots, yadda yadda... I'm looking at my exhaust after I took it off and I see that the right side I can look straight through it, while the left side I cannot.. it has something in it , I tried looking at the manual but It didn't show any parts inside the megaphone. Is this the baffle? The inside looks really dirty too, and the small holes on the inner wall are clogged.
From day one my GS has had bad mpg, and poor power issues!
any ideas trying to figure out a way to clean the exhaust out?

[Diablo1982]

Best way I always cleaned out mufflers on older bike was to detach the thing, soak it inside with a foaming cleaner that eats grime and stuff hose it out and take air compressor and blow that sucker completley dry

[goggleboy]

Best way I always cleaned out mufflers on older bike was to detach the thing, soak it inside with a foaming cleaner that eats grime and stuff hose it out and take air compressor and blow that sucker completley dry

what kind of foaming cleaner would you recommend?

[Graham]

If you can see through your stock muffler then it is bad. Replace them with a good stock set or aftermarket. Soaking them will get you nowhere.