yes
if your scooter has a engine oil dip stick then it is a four stroke. if it has a oil tank that you have to put oil in then it is 2 stroke.
Drain it out and replace with proper oil
You need special carb cleaner for 2 stroke engines. Since the oil in the fuel lubes the internals carb cleaner will strip off the oil leaving the cylinders to years worth of damage in a matter of seconds. Always use carb cleaner for 2 stroke engines.
The engine, I believe.
carb or timing
Four stroke. 2 strokes require a gas/oil mixture and buzz like a chainsaw.
Not if your carb is adjusted properly.
If you put 4 stroke what in it
For a 50 cc scooter, the oil capacity typically ranges from 0.5 to 1 liter, depending on the model. It's important to check the owner's manual for the specific oil capacity and type recommended for your scooter. When adding oil, ensure it is the correct type, usually 2-stroke oil for 2-stroke engines or the appropriate motor oil for 4-stroke engines. Always check the oil level using the dipstick or sight glass to avoid overfilling.
On my 150 cc Honda scooter, I just use 91 octane gas from the station. Also, if it is a 2 stroke, then you will need to put oil in the oil tank, But most 150 cc scooters are 4 strokes, which don't require this.
4OUNCES OF 2-STROKE MOTORCYCLE OIL/GAL. OF GAS
A 50cc scooter typically requires a 2-stroke oil if it has a 2-stroke engine, mixed with gasoline at a specified ratio (commonly 50:1 or 40:1). If it has a 4-stroke engine, it generally uses standard motorcycle or scooter engine oil, usually with a viscosity rating of 10W-30 or 10W-40. Always consult the owner's manual for the manufacturer's specific recommendations.