As above. Send it to a replate that offers hone as they have the right gear to measure and evaluate it, or replate if required then tell you what size piston to buy.
Something has happened. These top ends just don't usually wear out. 3 I've had apart were mint. I'd say 100:1 lunnie or water and grit air filter.
Check your bottom end for smooth running and no sign of blueing.
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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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