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8000 rpm's is about as far as you should push a GY6 if you want it to last. On a 125/150cc engine the max horsepower is probably closer to 7000 rpm's. If you do a lot of longer highway rides 7000 rpm's is a safer guideline.
Most 150cc scooter don't have a rev limiter. The first step would be to try lighter variator weights. You want the engine to pull 6500 - 7000 or so rpm's under full throttle, probably no more than 7500 rpm's at top speed on level ground with a favorable tail wind. I wouldn't advise running WOT for extended distances.
It wouldn't hurt to check the carb tuning, chances are it is set up borderline lean. 60 mph on the speedo is probably closer to an actual 50 - 53 mph.
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