http://zhidao.baidu.com/question/107073049.html [SAME vm22 but euro2 version]
Q:My Suzuki "GSX-3C" only one carburetor idle adjustment screw, no adjustment screws mixture...
A:GSX125-3C using a plunger type carburetor, which mixed gas adjustment screws are located directly
below the front side, and
close the intake hose between the carburetor and the engine ...
concave, so only crawl under or removing the carburetor in order to see clearly Its adjustment method is screwed to the end and then back on 1.5 to 2.5 turn
===
2.25 was quoted in some Suzuki forum. If in doubt, search pit bike related in 'net will give u the idea...