Honda EU2000i Throttle Control Motor Replacement!

I would presume that the Honda is like a Yamaha. You need to 'set' a new stepper motor after install by sticking your finger in the carb air inlet and physically holding the throttle plate full open and starting the engine. When it catches, remove your finger. That 'sets' the stepper motor so it 'remembers' the full open throttle position and allows proper partial throttle modulation. Thats SOP on a Yamaha, I presume the Honda is the same. Right from the Yamaha shop manual btw.