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if AFR is also ok, then the valve clearance needs to be checked (Tappet settings). it should not be too tight. a free movement of around 3mm will suffice. However too much free movement will produce 'tik tik' sound.
if this is also ok, then clutch plates need to be checked.


Then what is the meaning of a FILTER?. I hope you mean to say HIGH FLOW AIR FILTER
. My humble suggestion, please don't go for K&N or any other high flow filters. Stick to the OEM Filter only. Others will spoil the engine with partially filtered air.

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