I wrote the displacement calculator in my signature because it was the rule rather than the exception that a lot of china bikes were being marketed as 250s.
For example the TITAN 250 EFI, 6 SPEED SPORT BIKE, OVERSIZED FRONT AND REAR BRAKES, CUSTOM ALLOY RIMS [CA LEGAL]:
Bore × Stroke mm 65.5×66.2
With 1 single cylinder that is a 223 cc displacement engine.
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