I saw this in the Cycle Gear catalog today. Will it work on the stock carb?

Easily adjust the air/fuel mixture on your Kehin carbs with this convenient Air Fuel Mixture Screw from Trackside.

Features and Benefits
CNC machined from billet aluminum
Anodized finish for durability
Easy grip and turn design requires no tools for adjustments anytime
Numbered 1-4 for easy adjustment
Includes spring, two washers and o-ring
Designed to resist backing out due to vibrations
Fits Kehin FCR carbs

TRACKSIDE - Air Fuel Mixture Screw - Carburetor Jetting - Engine & Fueling - Parts - CycleGear - Cycle Gear

 

I doubt it. the kouba screw has a different part number the the fcr screw vs the one for the klx carb.