It is not uncommon for motorcycles to exhibit some degree of "creeping" or forward movement when the clutch is fully disengaged (pulled in). This phenomenon is often referred to as "clutch drag" or "clutch slippage."
There are a few potential reasons why this could be happening to your brand new MT-03 motorcycle:
Clutch adjustment: The clutch cable or hydraulic system may need to be adjusted to ensure proper disengagement of the clutch plates. It's possible that the clutch is not fully releasing when you pull in the lever, causing some residual friction and allowing power to transfer to the rear wheel.
Clutch plates: Occasionally, the clutch plates can stick or become glazed, preventing them from fully disengaging. This issue can arise in a new motorcycle as well. If this is the case, you may need to have the clutch plates inspected and possibly replaced.
Engine idle speed: The idle speed of the engine can also affect how the motorcycle behaves when the clutch is disengaged. If the idle speed is set too high, it can contribute to the motorcycle creeping forward. It's worth checking the owner's manual or consulting with a mechanic to ensure the idle speed is set correctly.
Given that you mentioned the issue occurring after the bike has been warmed up, it's possible that it could be related to the clutch plates or adjustment. I recommend consulting with a qualified mechanic or contacting the dealership where you purchased the motorcycle to have them inspect and diagnose the issue. They will have the necessary expertise to identify the cause and provide appropriate solutions.
Additionally, as a new rider, it's essential to practice proper clutch control and familiarize yourself with the specific characteristics of your motorcycle. Gradually releasing the clutch while giving it enough throttle can help prevent excessive clutch drag and ensure smooth takeoffs. Remember, riding skills improve with experience, so continue to practice and ride safely.