I own a 2013 Honda CB Unicorn 150. Apparently, I am getting poor fuel economy nowadays ranging from 30-35KMPL(40 Tops).
I have decarbonised the head, replaced the cylinder kit and valve stems around 200 KMS ago, bought new chain and sprocket(chose Hero Hunk/Xtreme's for better low end torque), replaced spark plugs, air filter, cleaned the carburettor and replaced vacuum piston.Yet, I'm getting really terrible fuel economy even though I ride only below 4K RPM or 40KM/h.
Also, is there any way to obtain an Air filter box unit,cap and cover ? The bike makes strange grunting noise when I give throttle.



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