The Hyosung ST7 uses a two-cylinder, four-stroke V-Twin with a total displacement of 678.2cc. This engine pumps out nearly 62 horsepower at 8000 revolutions per minute (rpm) and 47 lb-ft of torque at 7500 rpm. The V-Twin has loads of power for this cruiser however there is a noticeable difference in between different stages of the power band. The lower portion of the range has moderate levels of power and torque but the really noticeable power comes late in the power band with quick and strong power when you rev the engine hard. The liquid cooling system ensures that this beastly amount of horsepower doesn’t overheat the engine block.