Join Date: May 2016
Location: Gloucester, VA. & Manassas VA.
Mentioned: 2 Post(s)
It may be normal, if the throttle body is hitting it's stops.
Any cable control will have more travel at the input end than at the output end. Check that the grip will turn just a little bit more after the throttle body contacts it's stops on both directions. If you have too much over travel in the idle direction, you may be flexing the stop or body when you twist the grip hard to the idle position. (Result is the change in RPM) You may have to adjust both of the cables to move the excess free play to the full throttle side.
Be careful, move it too far and you will not go to idle, cables too tight might not go to idle with just letting go of the grip, too loose and throttle inputs will be hard to control.
Or you can leave it like it is and not try to turn it past where the throttle body hits it's idle stop. (This is what I would do )
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