Ditch the flathead and bloody knuckles. This thumb-adjustable low-speed mixture screw lets you fine-tune your air-fuel mix on your KLR650’s Keihin CVK40 carb without tools — even with gloves on.
 
Perfect for adjusting your idle mixture after a rejet, elevation change, or just to get your thumper running crisp. Whether you're trail-side or in the shed, it’s all about quick, precise tweaks with zero hassle.
 
Fits:
Kawasaki KLR650 (1987–2018) with stock Keihin CVK40 carb
Also works with other bikes running the CV or CVK carburetor
 
Features:
Knurled thumb screw for tool-free adjustment
Precision CNC brass body
Direct replacement for your stock mixture screw
Made in Canada by Mega City Performance
 
Note: Some models may have a plug over the factory screw — this needs to be driremoved first.
 
Tuning Tip: Start at 2 turns out from lightly seated and adjust from there. The engine should idle smoothly with minimal bog when cracking the throttle off idle.