I believe the general thoughts 200 vs 220 are really not that apparent. Both bikes do what their designed to do equally well.
However, the 220 seems to have more grunt down low, where as the 200 seems to have a little more top end. The CARB situation, on the 220(or so ive heard)can be resolved by swapping out a KX 125 CARB, or one from the KDX200.
Pipes for both bikes seem to be of the FMF kind. I, on my 200 are very satisfied with my PRO CIRCUIT PLATNUM series pipe. Its a little weak, but i run a pipe protector.
As for forks, the only real concern ive heard, or had explained to me, is that the front forks are only good for 130-140lb riders. Im 175, so i decided to goto a higher rate spring via FREDETTE RACING PRODUCTS. I dont have my forks re-installed yet so i can give you and A-B comparison, but i will in the near future(4 days). Jeff has a home page, but for the life of me i cant remember it. If you do a search, im sure its easily accesible, and has MANY TIPS AND TRICKS.
Have fun with either bike, you cant go wrong
Tony
P.S. Im no technicall wizard, so if i missed something dont hold it against me. All i know is that you mix the gas 44:1 and go RIDE!!! :confused: