I agree with the other posts :cool: clean the carb, and filter
however
My first bike was a 78 GT 80 and it had one of those removeable baffles also... That thing would get carboned up and it would bog down also from too much back pressure... A wire brush would'nt cut it, my dad would heat it up, with a tourch, or over a fire and burn all that spooge off, then wire brush it... But it's the spooge inside you can't wire brush off so when it the spooge gets all carbonised over the fire, lightly tap it on the ground and you'll see a ton more carbon come out from within the baffel... really heat it up and burn all that stuff out and it'll scream again...