So I have a 200xcw and a 2013 125sx. I was wanting to try a 36mm carb on the 125 to make it a little more trail friendly. The 38mm carb worked fine on the pipe but sucked pretty bad 0-1/4 throttle. So I swapped carbs between the two bikes. The 36mm carb did what I thought on the 125. The off idle response was a lot better and made the motor a little lugable. What really surprised my is what the 38mm did to the 200. It really woke it up. Not just on top but even off idle. I thought I had my jetting dialed in pretty good but now it's perfect. With the 36mm carb I was running the JD red needle 4th clip position 170 main and a 40 pilot sea level 70 degrees. With the 38mm same needle 4th position 182 main 42 pilot. The motor feels snappier with more power everywhere with no downside. I thought it would have hurt the off idle response and make it want bog, It didn't. The motor on the 200 is stock with only a FMF Gnarly added. I was wanting a little more power from my 200 and this did the trick. Next up a head mod.