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               Originally Posted by 
               xt660x2005 
                
               
             
              Please can anyone answer this: Stalling when you open throttle fairly quick? and also, during gear change down from 5 to 4? Everyone say, put some injector cleaner etc. But I think it is more than that? My own gut feeling is take it apart and clean injectors? am I talking
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         No harm in running some injector through. As mentioned - check the idle speed is >1400 rpm.
         
        
 My gut feeling is it might be a TPS problem, especially given the vintage of your bike. Have you checked this in the dash's diagnostic mode? What is the start reading on a closed throttle and what is it at wide open throttle? Does it increase smoothly, evenly and consistently as the throttle is opened?
         
        
 Have a look at these threads:
         
         
        
http://www.xt660.com/showthread.php?t=948
 
         
        http://www.xt660.com/showthread.php?t=56