Please post a top speed test also if you can. I am very curious if it will still reach 65mph+. I have been assuming the complex carb helps provide a better power band and is why the Riva 180cc engine is more compared to a 250cc rather than a 150cc which is closer to its size, but I have been assuming and would like to hear actual experience. Also do you notice belt wear or smell? I have read a couple scooter forums of people changing out the scooter style CV style carb to the common slide style carbs before, but have not heard from anyone who actually did it whether or not it caused noticeable drive belt problems.