Actually, the weights I found were 613 pounds for the 650 Burgman Executive, and 489 for the 400 Burgman. Yamaha's Majesty 400 claims 467 pounds. I didn't look for Honda's Silverwing.
The main difference for scooter controls is the rear brake, which is on the left handlebar where the clutch normally lives on a motorcycle. Honda's Helix had a rear brake pedal conventionally located. The scooters are automatic, using a centrifugal clutch and CVT belt drive, so there is neither a clutch nor shifter control. Some, such as the Burgman Executive, have an electronically controlled CVT with a paddle shifter that emulates discrete gear positions. On some scooters the left brake is a combined brake activating both wheel brakes, often with ABS. Because the scooters do not have a true Neutral, they usually have a brake - starter interlock so the starter will not energise unless brakes are applied. Because there is no way for the engine to hold the scooter in place when stopped (the centrifugal clutch disengages) they usually have some form of parking brake.
Many folks denigrate scooters as not being "real motorcycles." But in many ways the scooters are superior. Their automatic transmissions, along with fuel injection or automatic chokes make them very easy to drive. They almost always have built-in storage, usually big enough for at least one and sometimes two helmets. Their leg shields help to protect from wind and bugs, and their floorboards allow feet to be moved around (note that many upscale cruisers also have floorboards). When you look at styling you might note that the Polaris Victory Vision looks a lot like a big scooter.
If you want a lot of information about scooters from small to large, try
www.motorscooterguide.net.
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