I picked up a new carb for my BME 100 because it use to hang for a long time in the high idle. Today I put the carb on there and still no improvement with the high idle. Once the motor has run about 20 seconds all of sudden the idle will go down 300-500 RPM. Upon starting the motor I am noticing there is a slight kick back in the prop while starting. I am not tring to get a prop bite. Can anyone point me in what may be causing this wild type of idle along with the kicking back that I am starting to feel. I don't know how the timing is controled I would guess its locked into the C & H box.

Thanks N advance...