27-tooth Front sprocket with a stock rear backed up by a Biturbo and 15mm Amal carb with a #56-#58 Jet does the job right nicely - if it's a speed/torque balance you want.
(Tho your jet size may vary, mopeds can be idiosyncratic about that.)
More teeth up front = more top speed, less = more takeoff power.
More teeth in back = more takeoff power, less = more top speed.
Works like that.
As fer the bulbs...given the wattage, I doubt you'll find brighter, but it's worth a look.