That's when you lay into it. Been on enough bikes for that - might be headshake, loosen your grip, settle that fucker down. Might be floating - don't get squirely, and let out, problems start - get into it. You get another 10mph into them from that point, and it's scary how they "settle in."
I'm not kidding. Seen enough info on those Exploders going way over that, and being stable. Pin that fucker when it floats a little.
My big v-twin is like that, get's a little "light" about 115, so you stay in it. Once you're 125, it sucks down to the road real tight, and it's maxed at 156. And terrifying. Tuck, man, fucking TUCK!