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New generation for 2023: EFI, new cylinder, crank, clutch; lighter frame (Ultimate Motorcycling). Sources print 73 x 60 mm; Sherco gives 72.8 x 60 from 2025, so bore left null and engine_cc from the listed 249 cc. Fuel injection arrived on the ST two-strokes for 2023 (Dirt Bike: "Fuel injection comes to the 2023 Sherco ST two-stroke motors"; Ultimate Motorcycling 2023: EFI with 32 mm throttle body).