Hello Papan,
I have been riding Hunk for past 3 years,I also faced same mileage issue and also sometime feels bike is bit choking at high speed,went to mechanics but no result.
Then I read an article from an site regarding spark plug issue on Hunk,change it to bosch twin electrode spark plug.The bike feel lot smoother and there is not vibration which i used to feel at 60km/h.Also I started to refill petrol from Shell petrol Pump.which give good quality petrol.
Now I am getting approx 50km/l.
Hope this might help.
bosch twin electrode spark plug-Rs 120.



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