How do you change engine & gear oil on a Kymco Sento 50 scooter? I don't know what type of oil to use.

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.

• YTX5L-BS GEL Battery for KYMCO Agility 50 50CC 09

  https://www.walmart.ca > YTX5L-BS-GEL-Battery-for-...
  
  YTX5L-BS GEL is a 12V 4AH 80 Cold Cranking Amps (CCA) GEL (Maintenance Free) Battery · Dimensions: 4.40 inches x 2.75 inches x 4.25 inches. Polarity: Negative on ...
  Assembled Length: 4.40 in
  Assembled Weight: 4.23 lb $51.95

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 ...

..

Sounds like it overheated & seized, when you let it cool down, it started again. Two things to check is the coolant level, if very low then it could be a head gasket or waterpump seal problem.

The other is for two stroke oil, check the oil lever & that the two stroke pump is working. Previous owner could have been also running it on a pre-mix of oil & fuel in the tank, ask them about it.

Does the engine turn over? Does it have fuel and 2 stroke oil?

Check the battery.See if the gas is bad check the gas filters.Drain the gas ,have the carb cleaned.If it sat the gas is only good for 30 days.

u need to read your owners manual, it help me, it can help u to,take the time.

You put the oil in were the dip stick goes.Dont over fill it.You have to reset your oil lite ,there should be a reset button on your speedometer.

Somewhere on the bottom or bottom outside edge of the gearbox is a drain plug. Drain the oil and put the plug back in place. Somewhere on the top of the gearbox casing, including the left and right outer case covers, you will find a dipstick for checking the oil level. Fill via the dipstick hole. Some bikes don't have an actual dipstick but only have a top plug. Normally you will find it near the kick starter lever. When no dipstick is provided, they expect you to drain the old oil and then re-fill with the amount of oil specified for the bike. Use 10w40 motor oil. NEVER use synthetic oils. They can screw up the clutch.