Where is the sb26ss mixture adjusting screw of Mikuni carburetor? In 2002, Haojue Suzuki hs 125t, it was very difficult to start the old flooded tank in winter, but it was ok in summer.

Hello! I'm from Mikuni. The mixture spiral of this carburetor is on the left, below the throttle rocker arm. There is usually a black rubber plug. Pull it out and you will see the adjusting nail!

In order to meet the emission requirements of Euro II, this car is equipped with a catalyst without increasing too much cost. Generally, it is set thin, so there will be some problems when it is used in winter. So when you use it in winter, you can adjust it counterclockwise to 1/2- 1 (or 1.5), and then adjust it back in summer!

I wonder if the above suggestions will help you!