HI :-) My advice is have someone to turn the handle bar right and left while you watch the Throttle body ( Injector house where you have the butterfly valve) and see if the Throttle cable and quadrant moves respectively. If it does then the cable is routed arround the steering stam which causes the unwanted Throttle cable tensioning and causes again the unwanted RPM jumps. It is really easy fix if it is so. You just need to take out the fuel tank cover whEre you have the decals on then your fuel tank must be out too because the cable runs right under the fuel tank. Then release the cable from the injector house quadrant and reroute it the right way. Then it's just to put everything back and see if you have fixed it :-) it might also be as simple as cutting a zip ties the dealer used to tied the cable so that it doesn't vibrate, when you turn the handle bar it tensioned the cable which in turn makes an unwanted RPM jumps :-) Hope it helps ;-)
Have a great weekend :-)