New here need some assistance plz! Boom Bd250-5 "superbike"

[JonBoy420]

Hey guys ! Just bought my first bike the Venom Boom 250 superbike (bd250-5)
Im at the 50 mile break in range right now and am already ready to boost this things speed up drastically. I have not been able to figure out what mods I can do to speed this thing up. Its reports say 80-90 mph but i think it maxes out around 70 :/ cant tell because the speedo is fucking whack and doesnt read near the right speed at all. What can i do to go faster??? Are any other major manufacturers parts able to be uses on this bike? Also i want some crash protections for my fairimgs but again dont know which would work. Also it dies out at stop lights and stop signs regularly. How do i adjust the idle so I stop looking like a jack ass who cant stop stalling out? Thanks for your help!