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The key to more performance on a 50cc engine is one of three things:
1. Bigger bore. (=more fuel/air in each combustion stroke)
2. Higher engine RPM. (=more combustion strokes)
3. More air/fuel in your existing top end.
#1 may require a different carb/air intake/exhaust system to allow for the flow of more air (depending on where the bottlenecks are)
#2 is primarily impacted by tuning the CVT weights. You should really be looking to put the engine in its power band when doing this; faster isn't always better.
#3 is really only an option for 2-stroke motors (and is primarily affected by the exhaust pipe, and comes with its own set of tradeoffs), since the intake/exhaust valves in a 4T limit the airflow. In a 2-stroke there is a brief window at the bottom of the stroke where the intake port and exhaust ports are both opened, and a different resonator/muffler can change how much air/fuel gets pulled in at different RPM's.
You're not going to want to hear this, but I have to tell you. Putting an oversized carburetor does pretty much nothing for a 4T motor unless you are also putting in a BBK. You're wasting your time and money; the new carburetor does nothing that the old carburetor wasn't already doing.
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