I tried adjusting the air mixing valve (screw). the rpm still stays low. about 0.75.while on petrol its about 1.5
There is also idle adjustment on cng kit. Try that.
u adjusting the idle from CNG kit or throttle body?
there is only one screwpics added
I adjusted the blue oneThere was a similar thing (RED) but with no screw.
thats to adjust gas flow. messing with this will disturb consumption and pickiddle knob is on the reducer kit ( round knob which turns clock wise anti clock wise)
I hope you didnt fiddle with the high pressure solenoid - its the fixed large round device you just circled, the other adjustable screw is the main power screw.
There is also idle adjustment on cng kit.there is only one screw