Thats badass!!! Still running stock carb? I have a Honda Express NC50 with 70cc kit and MLM pipe. Ran that setup with stock 12mm carb for a while and topped out at about the same mph, maybe slightly higher at 35-37. Since then I've swapped to MLM intake and VM20 and it'll do 50 on flat ground. Bike picked up power everywhere with the bigger carb. Point being, I would look into a bigger carb if you're stilling running stock carb/intake