Chain lube, Carb. leaking fuel Super Power SP-70

Thanks for responding asjdsm

2- for leak in mixture screw, spring is OK. perhaps gap in thread. I thought to use some packing like a thin aluminium foil but then it will tear during adjustments.

3- carb sucking air on the side fitting on head. I have already mated the surfaces very nicely and installed new gasket two times. parts shop recommending to use cork type gasket but will it go bad by continuous fuel flow through intake? please tell if it can solve problem

4- long nose spark plug are available by NGK but not easily. but I have no idea what temp rating and other parameters should be there in long nose so as to match my engine requirements.

5- I heard Havoline deposit shield is the one with cleaning effects. but oil is very important for engine life and we need all properties not just cleaning thing. so we need to choose wisely

dismantling my carb today and a close inspection leads to this understanding:
The pin shown above leaking actually that pin is the ventilation from carburetor inside and to keep atmospheric pressure inside carb. I can see a whole near the main jet which when I blow air takes air out from the pin shown above. there is a small hole in the pin seen from outside. so this is not a pin but a pipe. and it is purposely kept leak.
Now in normal situation it must not leak. If it is leaking my first doubt goes on high float level. high fuel quantity in carb and when bike jumps, some fuel may be coming out from this pin.

so now please tell me how i can adjust/confirm my float level. in my bike it is a KEIHEN carb similar to the one shown in pic

ooh come on, I had a real bad experiences with Mechanics. ( sorry u good Mechanic guys. not for you)
Recently I visited mechanic for my engine seize problem. After 7 days of low load running, it seized again. as usual mechanic told me a bunch of new stories and new expenses. Just one visit to mechanic and most screws/bolts and other small accessories are now in some other clients bike whcich was being repaired in parallel with mine.

I had to do all job from start again and also do all expense do again. all money for mechanic repair vanished in a week.

For carb float level. no special tools are required. only a ruler (scale) or vernier and a sense to carefully judge how and where to measure the float position.
I am requesting the measure in cm/mm. The height of float balls what it must be as per the co. specs. for my carb/bike.

If anybody can help in this, appreciated.

Dear thanks for the idea. My carb lower pan where Fuel stays is plain with no marking. Can you show any pic to get me the idea?

thanks bro if carb is getting 'over' or flood does it mean more fuel level in my carb? how to adjust correct level?