Your moped might feel different for psychological reasons (i.e. the same reason that a freshly washed car seems to run better), or maybe something got bent and is actually holding you back. Look over your bike really carefully --you don't want $2 part costing you $75.
Be careful about parking on the sidewalk. Here in Canada's capital (Ottawa), I've gotten parking tickets for parking on the sidewalk. Here's the rub: one side of the parking meter is sidewalk, the other side is private property. It's as simple as parking on the correct side. Sure there are hundreds of bicycles parked on the sidewalk --the difference is [here anyway] that mopeds have license plates and <b>can</b> be ticketed.
I hate to see someone get a stupid ticket from a bored cop.