I have recently purchased a 49cc Yamaha Solaris. I've heard from different sources that with little minor maintenance you can unrestrict the bike. Is this true? People are telling me that instead of the 40 mph high end, I can be reaching speeds of 70 mph. Is this true? If so, what needs to be done? Is it legal? Will it hurt the bike? I'd appreciate any assistance that can be provided. Happy scootering!