My Haro F2 comes with a 44 teeth sprocket but from the bike check thread, it seems that most of you have sprocket with less than 30 teeth. How does this affect handling in general? For example, would more teeth means it's more suited for trails rather than park?
Yes, it's pretty much better in every way. The only thing that's bad about it is that as you go smaller in the front, the smaller the back gets and the bearings don't tend to last as long. You'll need to get a smaller freewheel if that's what you have, and the smallest gear you can run right now on a F/F hub is 33/12.
I have an old Haro F2 which I know on the heavy side to start with. Would the weight of it make much of a difference if I'm trying to learn to bunnyhop? Would a somewhat lighter bike make any noticeable difference?
I think when I get new bars I'm going to get the Shadow Vultus or Stolen Cell. I don't like the backsweep on Slams and now just about every company makes 8" rise bars with the same amount. I found the WTP Lock Stock bars too. They don't have 12* of backsweep like Slams either. I kind of like the Animal Sway bars too.