There is one more thing,when i check valve clearence i notice that right exhaust and right intake valves were on low side of factory specification(intake 0.09mm and exhaust 0.16mm) and left exhaust and left intake valves were on high side of specification or even more,but i didnt bother to reset valves cause were not so much out of specification(intake 0.15mm and exhaust 0.20mm).Is it possible that cam bearing is damaged.