Always best to clean PV but check movement and slop.
There's a bunch of info on adjusting slop out and disassembly (nyloc nut needs melting) check tech tips on home page plus do search.
Aus pipe should be nickel plated check you don't have a black one which could have cat (that really mullers them)
Pull muffler apart and repack. Sometimes they collapse.
I used to use 800 in my super high revving roadrace bikes. Good stuff. But I find Spectro Gold is fine on the 300. You will always get build up under both covers. Do follow the drain tube on left side. I cable tie it shut and open every so often to drain.
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'07 EC300 GG
'14 TXT250 GG
'? 496 CPI Cheetah RZ/RGV hybrid
'22 765 Street Triple RS
'21 XTrainer
'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
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