Whatever you do, don't call it a scooter. The Yamaha Y15ZR is what's known as a small-displacement underbone motorcycle. If you live in or have ridden in Southeast Asia, you'll probably be very familiar with this genre of bikes; but if not, you might mistake this for something that it isn't.
And, it isn't. It has gears. It is very much a motorcycle; just a small-displacement one. And there's been an Underbone racing category in the Asia Road Racing Championship (ARRC) ever since the series started back in 1996. The displacement categories have risen over time, as the displacements of the bikes available to purchase from OEMs has also risen.
The Yamaha Y15ZR is, as you may have guessed, a 150 from the factory. However, like many a race bike, this one has had the heck modded out of it to give it more power, better brakes, better suspension; you name it. So, running it against a KTM 390 Duke isn't as unfair and uphill a battle as your kneejerk reaction might, at first, lead you to believe.