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It fits fine on the stem but I did add more padding to make it fit. I had considered cutting the housing over the handlebars to add it properly, but I am glad I didn't.

But the more I use the case, the more disappointed in the plastic front. While I will agree with JCT842 (somewhat), a GPS may not be super bright, however, I can see the GPS when it is not in the case. I went on a 165 miles scooter ride today and used my cell phone because I couldn't get the GPS power working with the scooter. I got home fine, so it was bright enough for me.
This model I own may not be your best choice because of the case.

Couple things to think of as you look for your model:
You need to look your equipment (GPS or cell phone) size. What will match it?
The hardware you buy needs to hold your electronics secure. Not only does it need to grab it, it can't shake loose when going over bumps. Anything that can shake should have hardware that backs it up (rope or nuts that secure pieces together).
Do you currently have any hardware that you may want to use and just need mating hardware? Maybe you only need pieces to make the system. That is essentially what I have done with my case and what NickP looks like he is doing also. Good way to go if you have the other hardware.

Couple things I learned today:
Need to add power for GPS or cell phones. I am looking into adding a 12V power outlet as well as learning what the USB connector on the scoot will do for me.
Need to look at adding something to the seat for those longer rides. Fun ride, but got a little tough at the end of the ride.

The problem with a scooter is where and how to mount a GPS. You can't mount it on the handlebars like you could on a motorcycle since a lot of scooters have the handlebars under plastic. If there was an open area, there are plenty of mounting options for on the handlebars.

I bought a mount from Amazon (I love Amazon, I should be a part owner as much as I have bought through them). I have it mounted on the mirror shaft. I bought a model that has a water resistant case that fits onto that mount. I can use that case or my cell phone auto dock. I have only done a couple rides with the GPS or cell phone mounted, but they are secure and didn't cause any problems while riding.

As far as theft, I don't know. The GPS can be removed and hidden, the mount is visible but not obvious. I don't know that it will be any worse than not having the mount showing.

I know there is no fool proof prevention for idiot drivers rear ending my scoot, but after being rear ended on the last one, I had decided that an easy and relatively inexpensive add on is the flashing brake lights from the Back-Off module. I want to add 2 LED lights a little higher on the scooter and make all the LEDs flash.

www.amazon.com/Signal-Dynamics-Brake-Module-1004/dp/B001F85OUM/ref=sr_1_1?s=automotive&ie=UTF8&qid=1347455666&sr=1-1

Mode one emits 3 short flashes followed by one long flash (3.5 seconds); Repeats as long as brakes are applied
Mode two emits 5 short flashes followed by a steady on light; light remains on until brakes are released.

I have checked the internet and it sees that most bikes/bikers use the mode 2 option.

From my first check of the Jetmax, it looks as this isn't going to be really easy, but I think for a couple hours work and about $50 for the LEDs and the Back Off module, it will be worth it.

Thanks spandi.

When you do the install, be sure to have good epoxy type glue. Super glue may not do it since it doesn't have 'fill' characteristics. The magnet is spinning around really fast, and will create a lot of force. You need good holding power for it to stay in place as well as another blob of epoxy to keep the sensor positioned.

Having the magnet closer to the center of the wheel is better than having the magnet further out like on the rim near the tire. For the same tire rotation, the inner position may move 3 inches where the rim position may move 9 inches or more. Note-Numbers are representation only and not based on any mounting or actual measurement but inside positioning moves much less distance and so is a safer place to put the magnet.

To get the tire travel, I put the valve stem at the bottom of the tire. I have a 5 foot ruler that I laid down to measure stem down to stem down distance. I converted that to mm and had my numbers to enter into the bike speedometer.

The head of the unit normally mounts on a bike handlebars. There are 4 tiny screws on the back that when removed will allow the handlebar mount to be removed. I dabbed a couple drops of epoxy on the back (where the screws were removed) and used that to mount on the instrument panel. That is the last step in the installation, you don't want to be gluing this in place before all cables are positioned or you may find you can't route the cable well.

Finally, when the glue is cured, twist the speedometer/computer head into the receiver and you are ready to try it out.

This is a picture of my bike speedometer on my instrument panel.

The cable is routed down the steering column shaft area and out to the right fork near the regular speedometer cable.

Well, I made it through the first oil change at the 300 mile mark and thought this is the time to provide an opinion post. Since I am comparing it (in part) to my experience on my Jonway YY250T, it may not compare with other opinions.

This is heavier than the Jonway, bigger and beefier. It is also a lot more machine than the Jonway.

I had upgraded the Jonway by adding a electric fuel pump which added to the throttle range, but the Jetmax whoops its butt. This thing has get up and go all the way through the throttle range. I have not opened it up yet, but have had it up to 70mph. On a good day, I could get the Jonway up to just over 60mph.

Handling-Hmmm. I am not sure on this. I swear I could turn tighter or faster on the Jonway, but not sure. I do know that I have made corners on the Jetmax where I have scrapped on the road.

Comfort-I probably fit the Jetmax a little better. It has a nice back stop on the seat and the seat height is right for me. Getting on and off seems to be a little better on the Jetmax, better leg swing area.

Paneling-Seems tighter and better fitting on the Jetmax. The front skins come off in multiple sections; front, right half and left half vs. Jonway front and full cowling. There are a couple screws on the Jetmax that are a b*tch because of positioning, and replacing a headlight bulb isn't fun, but I have replaced the 35W with 60/55W bulbs. Smaller hands would eliminate having to pull off the panels.

MPG-about the same. I am getting (last fill) 63mpg. That is about the same as the smaller and less powerfull Jonway.

And as far as the oil change, this Jetmax has oil drain plug, paper oil filter and a primary oil screen filer. More filtration and more time to change oil than the Jonway. But, better oil filtration means it is better oil going to the engine.

(typing has got more difficult, dog has decided to have close time with me making the laptop not in the same position-she is old, I let her have what she wants).

Flaws-A few:
1) No luggage rack. I can get something from China, but it isn't cheap. Point to Jonway, cheap and includes luggage rack and top box. There is space under the seat, but not enough for my needs.
2) No Trip Odometer and of course, speedometer is not accurate. What the heck. How could you put that much into an instrument panel and not include a trip odometer? I added a bike speedometer to get correct speedometer and a trip odometer.
3) Glove compartment/front storage. Cheap. The door is very thin and bends easy. Don't store anything in there that you want to protect. The seal isn't good, so no water resistant seal.

I am expecting more years from the Jetmax and hoping to sell the Jonway as soon as it comes back from the repair shop where it is getting all new rear skins, fender, mud guard, etc.

I like my Jetmax very much and glad I have it. Sorry it took a woman not watching the road to cause me to get it.