That engine is based on the GS450 engine. Suzuki made that engine series for a lot of years. It's a well proven design. It's counterbalanced, so it is very smooth and vibration free. It's tuned higher than the 450 was. The 450 had a pretty wide powerband and redlined around 9,500 RPM. The 500 has crappy bottom end, but is fast and revs to 11,000 RPM.