That is because the mechs do not know this method...do not take it to a lathe guy since if the guy doesn't know his job then your Carburetor will be damaged...a new carb costs 6,000/- so try to do what I had suggested...many members have done this and the jammed AFR screw became free...
You may have to try applying the oil many times and try, but remember that it is jammed due to Aluminum oxide formation over a period of time, and requires the oil to penetrate to loosen up the screw....alternatively , you can try placing a thin screwdriver like the Line Tester type on top of the screw head and GENTLY tap on it with another small driver to loosen up the oxide coating..this may have to be done repeatedly in some stubborn cases...but remember to oil the screw area, wait for 15 minutes, then repeat the process...TAKE CARE NOT TO TAP WITH HEAVY SCREW DRIVER,SINCE IT WILL PERMANENTLY DAMAGE THE THREAD....

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And how to unscrew such jammed screw Guruji ?

For jammed AFR screw apply WD40 / Zorrick / 2 T oil / Brake Oil on the screw liberally...wait for 15 minutes and try to rotate it either clockwise or anticlockwise..For me the Brake oil gave the cure...do not apply too much force on the screw...you may have to apply and try a few times before achieving success

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Few weeks back I went to a mechanic here in Jaipur and he told me that he has to remove the AFR screw from a lathe machine..

Same here! Mech told me to do the same. Will have to remove carb and take it to shop so I've been postponing it for over a month now.

Our bike guru @psr sir ji is our only hope now

That is because the mechs do not know this method...do not take it to a lathe guy since if the guy doesn't know his job then your Carburetor will be damaged...a new carb costs 6,000/- so try to do what I had suggested...many members have done this and the jammed AFR screw became free...
You may have to try applying the oil many times and try, but remember that it is jammed due to Aluminum oxide formation over a period of time, and requires the oil to penetrate to loosen up the screw....alternatively , you can try placing a thin screwdriver like the Line Tester type on top of the screw head and GENTLY tap on it with another small driver to loosen up the oxide coating..this may have to be done repeatedly in some stubborn cases...but remember to oil the screw area, wait for 15 minutes, then repeat the process...TAKE CARE NOT TO TAP WITH HEAVY SCREW DRIVER,SINCE IT WILL PERMANENTLY DAMAGE THE THREAD....
Regarding the loud pop sound, it is the failure of the air cut off valve causing this...If you look at the carburetor from the Kicker side, you will see a small round part fixed with screws on the carb., with a thin rubber hose connected to it........ if the two screws are removed then a spring loaded diaphragm will come out..if this diaphragm is holed then this problem arises....you can source it from the ASC... look at Ref no 9

Good Morning psr Sir
Thanks for the detailed response.

For oiling the AFR screw I believe we need to remove the carb because as it is the screw is not in upright position so oiling will not be effective. Am I right ?
If yes, is there a DIY tutorial hidden somewhere to remove and place the carb back because I do not know how to. I read Aneesh's DIY on carb cleaning but it also didn't mention how and where to put external pipes/screws back AFAIR.

For removing a stubborn AFR screw do as psr sir says . Mine was as if welded together and an over enthusiastic effort deformed the screw head slightly . Then I used Zorrik+engine oil every morning and evening for maybe 4 days and then I could remove it .

Edit: carb need not be removed for this task .

A photo attached of the exact location would help us very much sir..

This should help found deep buried in this thread


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Pics posted earlier by ashwinprakas and psr sir respectively.

Thanks a lot mate.. I guess there is a small plastic cap I need to open to see this AFR screw..

Im not sure about the cap being there. I don't have any such cap.

Last time when I installed K&N filter, I saw the mechanic open a small plastic cap which was covering the AFR screw. I am sitting in office right now, will try to post the pic in the morning.

Ohkay! Will wait.

Heres a pic of my AFR, experts, it is pretty deformed right?

Replied on PM.

I am planning to change the tyres now.. I hope to get them in this month.. any suggestions mate?