yar my main reason for asking this question is that once i went to a mechanic for tuning and he adjusted the value clearance withoyut using the feeler gauge,, it was warm engine,, and after that tuning my bike was so responsive and power full just like a 100cc bike , it was vry ver responsive and pick was awsome .. so it implies that the valves were not exactly set , and later i tried twicwe to tune from the same mechanic but to no avail,, didnt got that much response,, so there should be some tricks to it,,,,,