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Well if you saw the video and how to test it and your tests did not even come close then you know something is not right. Why the stator is grounding out maybe a winding is touching the center ring.
COMPARE YOUR OLD STATOR TO THE NEW ONE and see if the wiring are the same is there a green ground wire on the old stator.

But the motor has to be grounded otherwise the spark plug will not fire.
Alleyoop

www.jclusa.com/Document_Support/Products_Support/MP250A/MP250A_wiring_diagrams.pdf

Yea check the bulb that is in there and see if they are the same as the S2 types that you say came with the scoot.

Back a few post you said this.


What was not tested is if in BOTH you had spark which is the important thing. You would want to have NO SPARK in one of the positions and SPARK in the other.
Alleyoop

8+ mile per hour winds expect to loose a lot of speed if it is hitting you head on its like putting on the brakes. The windshield and your body takes a lot of wind and slows you up quite a bit. You can see a little difference if you bend over to get out of the wind and you will see a difference.

Also keep this in mind If it is cool outside ALL MOTORS make a little more power, if it is hot ALL MOTORS loose power. Now with the new cars they compensate by retarding and or advancing the timing on it as well as adjusting the fuel ratio to not loose so much power in the heat.
BUT the scoots we do not have that luxury you set the carb to run good and loose or gain a little depending on the weather changes.
You will find riding in the evening after the sun goes down the motors make a little more power and you will notice your scoot a little more peppy.

From your runs your scoot is running good and you will find that it will not run good everyday, some days less power some days more power even on a given day you may notice a change in power. All depends hot the motor is getting. It all depends on how much wind is reaching it to help cool things down.
Alleyoop

Test the red wire at the ignition it should have 12volts all the time. Then put the KEY TO ON and check the BLACK WIRE on the iginition it should have 12volts on the ON POSITION.

You put the red wire on the wire your testing and the other black wire to ground just as if your testing the battery .
Alleyoop

here is what you need to do:

Usually what gets clogged up if fuel is left to long without running is the PILOT JET and its passage and the TINY HOLES by the BUTTERFLY. The Main Jet is pretty big so that is usually not the problem.
It is very easy to clean out the carb just take the carb off and take the carbs float bowl off usually about 4 strews.


Get a Spray Can of Carb Cleaner they come with a long thin straw to get into small holes and it creates good pressure.


1. Unscrew the Pilot Jet and Main Jet and clean them make sure you can see DAYLIGHT through them.
2. Then Stick the Thin Straw into the holes the JETS came out of and SPRAY.

THIS IS USUALLY THE PROBLEM THE PILOT JET AND THE TINY PILOT JET FUEL OUTLETS BY THE BUTTERFLY.



Alleyoop

Get a spray bottle of water and spray that area if the idle changes it is leaking.

DID you take the evap SYSTEM off( THE TANK VENT SYSTEM)? If so there had to be a hose going from the canister to the AIR BOX, DID YOU PLUG UP THAT CONNECTOR ON THE AIR BOX? You have to get a camera BOB and take pictures, All this could of been taken care off very quickly if I could see how things are hooked up.

Pictures are worth a thousand words.

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