This is a very easy task that takes less than 10 minutes, start through clean up.
The workshop manual calls for 75/85 GL4 weight, but the owner's manual said 80/90, so I am comfortable using the 80/90 GL5 Amsoil I found at a local motorcycle shop.
Mitch's Scooter Stuff on YouTube: provides a new 2018 clear 4K video in easy step by step tutorial!
Many thanks to Motorsport Scooters (ScooterWest) for putting together a number of instructional videos!
One thing to be aware of is don't loose the little copper crush washer on the drain hole bolt. It may easily fall into the container of used oil. Ideally, you should replace it with a new one. I did not have a new one, so I am reusing the old. I'll keep an eye out for drips, but I think I'll be okay.
To help it drain, and get out as much as I could I turned the front wheel to the RIGHT, sat on the floor on the left side of the scoot and using the hand rails at the seat, I tilted the scoot away from me (picture 6). It didn't take much strength, and it didn't feel like it was going to topple over. Obviously don't push it over too far, or fast as to lose control.
6mm hex head and drain bolt
Amsoil 80/90 GL5, and cup to add oil to hub (marked at 125 cc, half of 250 req'd)
Milk jug cut to catch oil
Drain hole seen through wheel, indicated by arrow. Plastic jug is seen just beneath it.
Plastic jug in place catching used oil
Scoot tipped to aid in draining (easy enough to hold camera while tipping)
And finally, filling gear box