The 450SR S shares its parallel twin engine with the existing 450SR and 450NK models, but it?s visually the closest machine yet to the original SR C21 concept bike from 2021 that first housed that motor.^^With a 270-degree crank to add a bit more character, plus double balance shafts, the DOHC motor clocks in at 449.5cc thanks to a 72mm bore and 55.2mm stroke, giving it an oversquare, rev-happy nature. ^^Peak power arrives at 9,250rpm, which is 750rpm lower than the revs that the standard 450SR needs to arrive at the same maximum output, while torque is unchanged at 39.3Nm (29lb-ft) at 7,750rpm. The difference in the peak revs is likely to be down to the new exhaust system of the 450SR S, which packs its silencer under the engine instead of on the right-hand side to give a clearer view of that single-sided swingarm setup and make rear wheel changes easier and quicker.^^The engine drives through a slipper clutch to a six-speed box, as on the standard 450SR, but gains electronic traction control.
