Both of these Spyders have same engine but yet the F3 is more high performance or quicker. What makes the difference in these two machines engine wise I am speaking of. I have an 2014 RTS but the engine doesn't have the same reponse as my 2009 Sypder had. The 990 engine was a lot more responsive when getting on the throttle than the 1330 RTS. This might have been address in earlier post but haven't been able to find my answers. Can anyone help me on this. Thanks