I don't know what it was, but it went away after it was serviced. I'm thinking they didn't tighten down a bolt or two and didn't want to admit it.
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2012 CBR250RA all black w/ ABS, blackened muffler heat guard, P3 brake flashers TS+.
Green: reflective rim decals, LED lighting, custom "to punish and enslave..." lettering.
Riding gear: Icon Contra Mil-Spec Hi-Viz & HJC CL-16 helmet
Planned: Demon/Angel Eye 50-55W HID projector.
My MPG via fuelly: