I have no idea if it's ported or who did the work.  It has a FMF pipe.  I will have to get sizes of jets on Sunday and will check the bolts on the reed cage and clamps on the carbuerator to make sure they are all tight.  How do I do a leak down test?

Thanks Derrick, I was looking for that video 

Let us know what carb is on it, it will say Mikuni or Keihin most likely. If it is a Mikuni look for these numbers.

43b00 = 87 model year

43b10 = 88

43b20 = 89-90

Those are the factory lt500r Mikuni TM38(38mm) carb numbers and are excellent carbs that can be modified. The Keihins are an aftermarket carb, I personally don't like them they have less tuning circuits.