I'm not sure if you are talking about oil or the gas.
In case of the gas -
It will run. no side effects.
It will overheat the engine
Nothing at all!
No - it is formulated very differently. The crankcase of a four stroke engine needs conventional engine oil. DO NOT use two stroke oil in the crankcase.
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.
No you can not.
No, you cannot use a two-stroke exhaust pipe on a four-stroke engine. Two-stroke and four-stroke engines have fundamentally different operating principles and exhaust systems. A two-stroke exhaust is designed to accommodate the unique scavenging process of two-stroke engines, while a four-stroke system is designed for a different exhaust flow and timing. Attempting to mix them would result in poor performance and potential engine damage.
Well the first necessary piece of information I would need to know is: Is it a two stroke or four stroke engine? I assume its four stroke as I'm sure you know that you need to mix two stroke oil with petrol and then put it in the tank if it's a two stroke. In that case, 25 to 30ml of two stroke oil to a litre of petrol is perfect. On the otherhand, if it is a four stroke, 300-400 ml of oil should be about right.
By putting only gasoline in a two stroke engine you can destroy it. A two stroke engine requires oil to be mixed into the gasoline to keep the moving parts lubricated. When you do not have that oil there it will not lubricate correctly and therefore scar and break the moving parts on the inside.
Drain it out and replace with proper oil
No if it says 4 stroke or 4 cycle you can not put it in a 2 stroke or 2cycle engine.
2 stroke and 2 cycle mean the same thing
Ordinary 87 gasoline, the same you put in a car. It depends if it is a four stroke or two stroke engine. If the engine has a separate filler for oil then plain petrol will do. If there is no separate filler the 25 to 1 petrol /oil mix should be OK.