I have a GS500 restricted to 33bhp because of my license. I was told that I wouldn't notice a difference. But the top speed I'm getting is around 60mph and it does not want to go over 5000rpm. At 6000rpm the engine sounds like it's going to blow up and it vibrates a lot. 4 weeks ago when I just got it restricted I was able to get 80mph. What can I do?