Question edited for clarity, changed 'carbonator', (a thing that puts bubbles in soda) to a carburetor (a device that atomises gasoline).
The new battery is fine, in fact 6 amps is better. It has more staying power and will start the bike easier in cold weather. It is better for your lighting as well. The problem is likely to be that your battery is not fully charged when you got it. Put it on a 2 amp battery charger for 8 hours.
These two adverts have 4 amp and 7 amp as suitable.
Kymco Agility 50 Scooter and Moped Replacement Battery ...
https://batteryclerk.ca > ... > Scooter and Moped Batteries
Kymco Agility 50 Scooter and Moped Replacement Battery (2009-2016) · Voltage: 12V ·
Capacity: 7Ah · Cold Cranking Amps: 135 · Polarity: +/- · Terminal: B · Dimensions ...
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