Speedfight4 Ice Blade 50cc 2T LC

I've added a leo vince tt sport to my bike in addition to lighter rollers, and a pollini 50cc racing cylinder kit and I've also upped the jets by 15%, the acceleration has increased massively but the top speed is still only around 55kmh(32mph). Was wondering if anyone can help me out and knows how I can increase the top speed, thanks

 

Sorry when I said leo vince tt sport i meant to add exhaust on the end of that

 

I had the same issue, fixed it by taking out a plastic tube from the variator