Review on NICECNC Orange Air/Fuel Mixture Screw Adjuster for Keihin FCR Carb, Fits Honda Yamaha Kawasaki Suzuki CRF YZF WR KXF KLX RMZ Motorcycles by Alexander Chavis

Ordered 1 (was skeptical) for my '93 Honda Shadow VT600. Removed from packaging but also removed complete with spring 1, then washer and finally o-ring. After doing about 10 turns, I did 2 full turns and checked with two gauges connected. It only took about 1/4 turn and it worked great. (Note I replaced the hard spring, it came with an OEM spring. Much smoother feel and didn't move at all) No threading issues like most people. Numbers have made adjustments in one go. Knowing it worked, I ordered a second one for a different carb (double carb).