Ive only destroked cranks, but for racing racing class reasons. Square stroke to bore is best on a 2 stroke for a given cc but more is easy increase. A spacer above and below are often required but you have to look holistically.
My CPI barrel and matching crank on my RZ350 adds 7mm stroke but was designed to have right port timing so extreme example.
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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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