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I have a 2012 Super 8 2T.  27 MPH out of the crate.  I let it get 99 miles on the clock, did a lot of homework and luckily got it right after some minor wasted efforts.  Stop wasting your time and get the Malossi 70CC kit.  It needs this modification to get the power and speed.   It was easy to put in, about 1 hr.   I increased my main jet to a #95  and put a high volume air filter/boot.  I also used an EBay $30.00 racing variator and smooth bushing.   I now get 40 MPH easy and have had it up to 54 MPH tucked on the expressway.   I did have to pop the protective blank Idle Jet Cap and adjust it to have it start easily and idle.  That's it!   See my other Super 8 posts for carb mod pics.  The speed mainly came from the Malossi and stock carb mod

My son uses it daily for school and loves it.  600 miles on it so far

42MPH on a flat road.  Great acceleration.   It took some experimentation but I got what I wanted.   
Mallosi 70 CC Kit
Stock Carb with Main Jet increased to #95   YOU MUST DO IDLE SCREW MOD
Air Filter
Scooter Assassin's Variator from EBay ($26.00) with Variator Boss Modification

Don't waste your time with the CDI or exhaust change as both are un-restricted on this model and year.   Glad I also didn't need to pay 200.00 for a new Carb.  Stock with jetting and adjustments was fine.

The only additional work I plan is a Kevlar Belt because I expect to be eating mine.  The biggest issue was the carb adjustment.  I had to remove the Idle Mix Brass Screw Cover and work a slot into the screw head below so it can be adjusted.  I used a plain Hack Saw Blade to accomplish this.  This was the key to get it to Idle and start after the mods were done.  If you don't it will idle erratically and be difficult to start when cold.  I attached a Carb pic showing the screw modification.   Mission Accomplished!   Note that the scooter is now surprisingly loud because of the air filter mod.  Just as loud as if I did an exhaust mod.

The rattle is comming from the pin hinge in the factory case.   It's a quality control issue and poor manufacture.   I could try asking Kymco to warranty it.   Thats why I wanted to know if other had seen the same with their factory boxes.

My GT300i TOP Case hinge rattles when the bike is idling.  This is caused by free play in the hinge pin.  Is anyone else having the same issue?  Remedied?  I tried using Hot Glue to make the hinge pin assembly tighter but this only lasted for a few days.

Att: Moderator
The 2012 and newer Super 8 50T model is a new design with different mechanical components and requirements (Motor, CDI, Wiring, Mono Shock Suspension vs Dual, etc).  One must weed through the current Super 8 Group to discover posts for this specific year/model.  An example is that I have had no responses on the 2012 model on basic mechanical questions solely related to this production yet the threads have had many views.  It would be nice to see all posts relating to the 2012/13s in one place.  Most of the current members/viewers probably have older units.

I am working on getting  out of the 27 MPH stock depression.  Located adjacent to the battery, under the floor foot rest trap door, 2012 CDI only has 6 wires, much less than older super 8s that required the cutting of one of the 8 wires.   I want to understand if a CDI mod is required.  I know about the carb jets and variator mod requirements.

Mine is 2012.  I would imagine 2013 and beyond will be same.  It's  due to a turn-signal revision for USA scooters