135mph+

As I was riding today, I was on the freeway and was able to get her up to 135+MPH. As I hit this speed I started to feel a little shaking in the front. The handle bars were just a bit shakey. I want to try to max her out before the season is over so i can get a few mods done over winter and come spring see if I can top my old speed. Does this happen to anyone else as well with it shaking at high speeds. I started to feel it at 135 and it stayed the same up a few more mph. Any ideas on this guys??