2012 vs 2013 600 engine changes?

[RexFlex23]

Were there any motor changes by Polaris between 2012 and 2013 model years to the 600 Liberty motor? One better than the other throttle response wise, etc.?

 

[ak]

Were there any motor changes by Polaris between 2012 and 2013 model years to the 600 Liberty motor? One better than the other throttle response wise, etc.?

I've owned both the electronics changed on the 13 vs the 12. As far as performance they felt the same. Both great sleds.