Check out (miami scooter club) on youtube. He really pushes his Vader. He has a stock carb, 90jet, air box mod, 17t sprocket and I think an AR exhaust. He commented his bike got to 63, although I'm sure he's gotten it faster since.
I have the Vader 125..
I have stock carb, pod filter and jets coming in the mail today. I took off the exhaust heat shield, drilled out the exhaust and installed a 16t front sprocket. I've pushed my bike to 7000 hit a max of 56 mph. Plan on ordering a piranha oil cooler kit off amazon later this week. I hope it works.
Make sure you check your front fender, when I got the bike I know I tightened it. Vibrated loose and had to re-tighten it. Mine vibrated so much it was uncomfortable to ride. Riding often or whenever I get the chance, the vibrations have gotten better. Also, my break light is just kind of floating...probably cause for a lot of the vibrating going on.
https://www.amazon.com/Piranha-Compl...oil+cooler+kit