Modifications to the variator system should take place one at a time, in the order I've listed, unless you know what you are doing, "shotgunning" a bunch of mods at once really doesn't accomplish much.
Both 2 strokes, and 4 strokes, behave differently, what works for one doesn't necessarily work for the other.
There are claims that the GY6 is good for 12,500 RPM, I don't know, never had a tachometer on one.
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