Now, the stepper motor comes into play here. The stepper motor is what controls the idle, which is placed on the throttle body; a faulty stepper motor means invariably high fluctuating RPMs, which is not related to the butterfly valve. I'd suggest you start off with the throttle cable, check for proper routing, and then check the stepper motor. Keep your observations posted.
Don't give up yet.

Cheers!
VJ


.I own a Duke 200 (2014 Make) and now the odo is 42K . Right now i am facing an issue of bike turning off when shifting down from 3-2 and 2-1 in traffic. I have been servicing the bike in correct intervals and I take care of her good .Please share your thoughts on the issue.

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