You must not know anything about scooters or auto mechanics to ask that. A 50cc scooter, is a scooter with an engine that is 50cc, which is roughly a cube that is 50 centimeter's on all of its sides., rougly. You can't make the engine bigger, nor can you turn it 'UP' as you put it. There are claims of making it bigger but you can't. In actuality of what is going on, is that they are increasing the power it puts out by replacing other parts like the carburetor and rejetting it, the scooter's computer, and other parts to make it push out as much power as bigger sized engines do.
Say someone says that they had a 50cc scooter and made it goto 60-70cc, what that really means is that they either replaced the engine with a 60 or 70cc engine, or they changed the stock/OEM parts that came with the bike with high performance parts excluding the engine itself and made it as powerful as a 60cc or 70cc scooter.
That's all it means.
-Anthony V
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