Hi, I got my bike running last night (carb cleaner and a battery) and I rode off and on from about 7 at night till midnight. I put on 125 miles last night. It didnt really pull hard till about 9,000. How much would a filter, jets, and exhaust do for this bike? Or would I be better off leaving it stock and selling it  when I can afford a bigger bike?
Thanks,
Jason

If you just got it running,  it probably still needs some tweaking and maintenance to be running properly. That is always the first thing to consider, before looking at mods and upgrades.