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First of all, don't go WOT on an engine that is still in the break-in time.
You'll ruin the engine, giving it an early retirement.
it takes on average about 500 miles on city riding before the engine opens up a bit.
Do regular oil changes.
After a good 1000km the engine will feel much smoother, the sliders will wear some, allowing the engine to rev higher.
But 55-60MPH is about the max you can get out of a 150cc.
If your scoot recycles the exhaust gasses, get that EGR out, and re-jet your carburetor. Usually that could account for ~5MPH higher top speed.
Do one modification at a time, test thoroughly, and think before installing any other mod. Not all mods that are labeled 'performance' make your scoot run better.
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