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Originally Posted by FMYStreetRacer
where did you get the specs from?
wonder what the max and min are? i know on my Honda civic my intake and exhaust i go .002 under what the book says. it kinda acts like a cam and gives more lift and duration. i wonder if the valve springs in these motors could take it?
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The specs are directly from my Roketa manual that came with the bike. No max or min, valve lash IS what it is. Running the valve clearance tighter then spec is a bad idea. It is set to factory specs for a reason. If you set it too tight, the valves will be held open when the motor heats up and you will LOSE performance. Setting the clearance tighter might get you a little more valve lift safely, but it would have nothing to do with the duration. Cam lift duration is a function of the cam lobe profile, and that can only be changed with a different camshaft.