Raptor not runnin right

[ECATV Raptor]

I recently changed both my sprockets and chain with a aftermarket one. Now when I just start it up and let the choke run for a little to warm up I put it into second and there seems to be not much there. If im starting on a slight hill there isnt enough power to drive it up. So then I end up eventually shifting up into 2nd then 3rd then 4th and I will have it maxed out and it isnt going that fast. It takes a super long time to get it to running right. At first I just thought because it was cold out it just needed some time to warm up but now it does it everytime. I dont know whats wrong with it. Any ideas?

[Katz_2003]

does the motor rev up? if your motor is reving and your not going anywhere your clutch is either not adjusted right or is no good.