Hi I have bajaj boxer ct bike i am facing serious average problem it g

Hi
I have bajaj boxer ct bike i am facing serious average problem it gives me just 20 kmpl !!!!!
I have changed head valve and also tried another carbourator.
New spark plug but still average is 20 kmpl
Kindly suggest me exact solution on this.
Ur prompt solution is expected.Thanks
Rajesh 9226546428.

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