The thing about restriction of a race cylinder, is unlike a low hp cylinder where the ports are small, a race cylinder you have the same piston running over the same large ports at the same revs (unless a different cdi) just with less force pushing it down as the inlet or exhaust has been flow reduced.
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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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