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Hi guys be brought my son a kymco auto 50cc agility for his birthday it hasn’t been run or didn’t start for a year prior to when I brought it I got a new carb new battery new spark cleaned the fuel system out and refilled with clean petroleum and added sea foam in and a new fuel filter the bike started on the kick start but won’t on the electric start it ran then cut out straight away I started it again and revved it this time and it stayed on so I let it stay in high rev for a while to work through the system after this I tried to let it idle but it always cuts out no matter how many times I start the bike it just revs on its own high then low high then low then cuts out can anyone help please