I'm sure that some folks have tried it and failed miserably! I think that you need some precision equipment in order to dial it in to 36 +/- 0.05 ish mm's. If you can find a machine shop that has the right equipment, they could do it for you pretty easily I would think.
but there are very small holes in the bore of most carbs that will probably need cleaned out. there are several machinist by trade the forum here and I have not heard of them dyi
yep I would'nt I think the motor is perfect in every way with the fmf pipe and a 13-50 sprocket setup I luged the heck out of it in the deep mud/water a few days ago I do know I will be looking at a clutch soon
A 35mm carb is huge for a 200cc bike. I don't think the KDX200 is under-carbed in any way shape or form.
You are right: that's a negative cost/benefit ratio to bore the carb 1mm.