I recently tuned my pulsar150 2011 model which has this ucal carb. From full tightened position, i turned the volume screw 4.5 turn and ran the bike for 100km with new plugs. Now i can see the bike runs good when cold but gets hot at higher rpm and loss of torque and acceleration Also engine sound changes as if the timer chain feels loosen up . I have enclosed the right side spark plug and requires some noble guys expertise to tell of the mixture is too lean.
Bike has ran 21500km. I appreciate your help