Sounds odd. I wouldn't have said it was "normal" if it wasn't vibrating originally then suddenly started doing it.

Obvious question... Did you do anything different to/with the bike at the time it started vibrating more noticeably?

Where are you feeling the vibrations? Handlebars, footrests, seat... or everywhere! What sort of vibration high frequency, or low frequency?

First thing I'd check is the engine mounting bolt torque, particularly the top one.

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