get an emission done and check if your co and hc are under control
my vehicle co had touched 6 %
then got my carb checked and found the air screw rubber washer was damaged

Hi guys!
The issue has been resolved now and I am again getting mileage of 60 kmpl from my CBF. Actually, when I came back from the trip, my bike faced some minor issues due to which I noticed a drop in fuel efficiency figure. The disk pads were rubbing against the disk due to which, the front tire movement was not free. The chain had gotten very dirty. Also, the carb setting was not correct. I also found a very experienced mechanic who inspected the valves (as Honda ASC guys suggested ) and the valves were fine. They were not weak or faulty. These were the minor issues.
Also the issue with self starter, it was just the throttle cable that was a bit loose. Got it tightened and now the self starter is also working fine.

Thanks to everybody who took their time and helped me on xBHP .

@ Mods: This issue has been resolved. You can close this thread. Thanks

a quick question...if the disk pads are rubbing against the disk...does it make noise?? how much wheel movement restriction indicates disc pads rubbing...my rear wheel makes whistling noise from disc if rotatd in opposite direction but i correct direction no noise....fron wheel makes khas khas noise...very slight noise when rotated..but on the move...no noise...

Get it checked by mech soon, else either one will get ruin. Never wait in such scenarios, it effects the pads...sometimes it ruins the surface of Disc plate too.

i always thought khas khas sound is normal...

and while riding i get no sound at all..and braking is simple amazing...

btw its a 200ns and not even 2 months old

also yesterday after a 6-7 km long ride with a mix of highway speeds and traffic jams when i return home i touched the disks and they were hot...not burning hot..just...normal warm hot....is it abnormal??

anyways have to go to SVC after my exams

If disk pads are rubbing, the movement of the wheel gets restricted. Put the bike on center stand and try to rotate the wheel. It should rotate freely. You need to get this checked as there is a possibility of disk pads rubbing against the disk.

Re: Low mileage issue with Honda CBF Stunner

Hello Sir...
I just have exact problem in my bike
It is nearly 10000 kms i serviced it to some mechanic they charged me for everything like engine head valve ,oil,air filter etc. But i am not satisfied with my spark plug because it is still carbon foulded in every 1 or less km..
Previously i was getting mileage of 55 but now its about 30.
I just want to know why i am getting carbon foulded spark plug everytime when i check
What is gone wrong in my bike?
Hope You will reply ASAP
Thanks