For giggles, because we're running out of ideas and new piston etc bring better compression, can you try a better gas, AV gas if you can get it easily, just to rule out that or season differences perhaps.
Obviously try new plug to see if any improvement. Check cap resistance or swap out.
Does it get worse as hot? Stator don't last forever. They get a little weird but usually heat breaks them worse.
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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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