Yes you can say that, but there many other popular brnds like Yamaha, Honda, Kawasaki and Suzuki.
motorcyclesdir.com/
Honda, Yamaha, Kawasaki, Suzuki, KTM
KTM
KTM manufactures the fastest production dirt bike under 80cc, the KTM 85 SX. Known for its high performance and lightweight design, this bike is popular among young riders competing in motocross events.
Get a KTM
ktm
Dirt Rider magazine said that the dirt bike of the year was, KTM 350 SX-F
you don't!!
Ktm 125sx
They are quicker and more powerful and are like the Ferrari of the dirt bikes and are built for speed and racing and the Honda is like the Holden and Ford and is a basic dirt bike!
I have a ktm dirt bike trying to find out the year the number is ktm8701*45853*
go to the KTM website. google it " ktm ", they have some odd stuff.
The fastest dirt bike in stock is a Suzuki But most lots of people don't agree they normally think its the ktm that's all a opinion.