Installed on my 2021 SSR 125 with the 22M Mikuni Carb. This was really needed just for ease of adjustability. The stock Air/Fuel Screw was extremely hard to reach making it a hassle to make small adjustments. This took no longer than 30 minutes to install and this also has helped me get my jetting right on the bike. Highly recommend to anyone buying an aftermarket carb for their pitbike.