Just picked up a very clean 2000 kx125 with the keihin carb w tps sensor. I already have a 2001 kx125 with the TMX mikuni that is jetted perfect and flat out rips.
Any benefits to keeping the Keihin on the 2000 vs. converting it to match my 01. FYI my two sons race these off road, so I like the consistency of two indentical bike setups.