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
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
No you can not.
depends if its 4 stroke get a new oil pan if 2 stroke just get a new exhaust or a new gas tank.