If your warranteed scoot stops running on the road for any reason other than lack of gas, this is a warranty issue!
Give them a call. Unless you've run well over the mileage for your spark plug life (see the manual for replacement miles) on a nearly new scoot like yours it probably has little to do with the plug. If a 2 stroke - gas /oil mix correct?
It could be several things - but with your warranty - it is their problem , not yours. That 2 yr warranty is one reason you bought a KYMCO scooter.
And please let us know how it is resolved.
Good luck
Stig