I haven't heard of anyone having a throttle body sync done on an AN650 yet, but it was a common cure for V-Stroms. It is basically the same fuel injection system. I think the ecvt tranny kind of hides the problem if the throttle bodies are a bit off, where with a standard transmission bike you feel it much more. The other occasional issue with the V-Stroms was air leakage at the throttle body boots. Sometimes a backfire would even completely dislodge a boot. I did have a minor low rpm surge on my V-Strom last year - and a throttle body sync did resolve it.magyver said:Two things come to mind what is the idle speed ? Should be 1200 rpm next would be the throtle body sinc. Has to be done by a dealer unless you have the factory manual and a dealer mode switch.