I run a lectron on my yz125. It works great and had obvious differences over a well jetted tmxx. You can get lectron to make you a set of downdraft carbs in your size preference. You can also find a couple of companies online that have cable operated tps.

Obviously there is a benefit to using either vs the stock 32mm on the nsr but I don't feel you'd get the full effect like you would on a dirt bike.