Yamaha Aerox 4 50cc restriction?

I have the yamaha aerox 50cc 4 stroke liquid cooled scooter with fuel injection and I m trying to find all the restrictors that make the bike go 49km/h max. So far I ve taken out the washer out of the variator, which helped the max speed go from 49km/h to 55km/h and I was wondering what else could be restricting it... show more I have the yamaha aerox 50cc 4 stroke liquid cooled scooter with fuel injection and I m trying to find all the restrictors that make the bike go 49km/h max. So far I ve taken out the washer out of the variator, which helped the max speed go from 49km/h to 55km/h and I was wondering what else could be restricting it s speed? I ve noticed that the rpm s aren t restricted, so I don t think the electronics are the problem.
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