The Harley Street 750 and the Duke 390 are two different motorcycles from different manufacturers with varying performance characteristics.
The Harley Street 750 is a cruiser-style motorcycle, powered by a liquid-cooled, V-twin engine with a displacement of 749 cc. While it offers a decent amount of torque for city riding, its top speed is relatively lower compared to sportier motorcycles.
On the other hand, the Duke 390 is a sporty naked bike manufactured by KTM. It features a single-cylinder, liquid-cooled engine with a displacement of 373.2 cc. The Duke 390 is known for its agility and performance, and it has a higher top speed compared to the Harley Street 750.
In terms of raw speed and acceleration, the Duke 390 is generally faster than the Harley Street 750. However, it's important to note that the actual performance can vary based on factors such as rider weight, riding conditions, and modifications made to the motorcycles. It's always recommended to refer to the official specifications and conduct performance tests for accurate and up-to-date information.