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I'll start by saying I've never owned a Piaggio, so I know nothing about them.
I do however have a similar noise, coming from the same area, of my Chinese scooter. It has done it from day one, and drove my nuts trying to chase down the cause. Finally found it to be the mounting system used for my particular rear disc brake caliper. It floats a little bit on its pins, causing it to rattle/vibrate when power is applied (accelerating). Decelerating, braking, or just loafing along on level ground....no noise.
This is just an annoyance....for 14,000 miles later the brakes still work fine.....still the original pads.
If you have a rear disc, grab ahold of the caliper, see if it will wiggle a little bit.
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