usually its no serious issue common inaccurate settings of clutch or engine speed is set low
regarding sound i am unable to understand from here what kinda sound does it produces if
its running fine no sound in gear or running i think its just sound of engine shutting off as the
bike either clutch or engine speed or even mixture settings are not set properly
i suggest you go to honda antenna mechanic or honda warranty claim mechanic in your city
tell him bike engine is shutting off when leaving it in idle position or like you said when pulling clutch