well yes a bigger carb would be good, you can find a oem carb for cheap, not sure on the cdi, if chuck didnt **** off kyle, he could tell you if you can use the cdi. lol
but i think if you take out the 1 down tube that goes into 2 tubes and just put 1 tube on each side then you would be ok, but yes put motor in first with pipe. oh and you will need a 87+
pipe, either way you gonna spend a little bit of cash, but most guys like the 87-92 motors