Making my Cabra S4 move

First, hello to everyone. My Cobra S4 should be in this week. I have been reading about it here and it seems to not move very good out of the box. I am 6'1" 250 pounds so if this thing does not move very good with some of the guys on here that are 150 pounds im gonna need some mods. Im not trying to break any speed records but if I could get it to go 25-30mph with me on it that would be great. I dont know if that is to much to ask because I really dont know what to expect from it in the first place. I did read about changing the chain, and sprocket to make it get up and go quicker off the line so I already plan on doing that.