Thanks,
Carbon and sludge was there in small quantity.
Now a days feel of lean fuel at around 5000 rpm
It may be due to low temperature.
This bike seems very sensitive to fuel quantity and quality.
Already changed air fuel mixture ( higher side) for low to mid rpm range but still feel of lean is there around 5000 rpm.
Also tried 50:50 mixture and pure hi octane, but std fuel performed best.