Check gearbox bearing but they live in oil and should really last the lifetime of the bike.
Measure the ring end gap. 0.5 to 0.8mm on a 300. Mine was barely worn after several years so it went back. Ran great today, idle issue gone.
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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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