2stroke maniac wrote:....................now,my bottom cylinder makes more power than the top one,do I need to set top cylinder power valve as well? you can feel the one exhaust pushes out more compression and smoke than other

IF, and I doubt that, you can FEEL a difference in power between the two cylinders, you have a bigger problem, than RC valve adjustment.
You can't judge from the smoke. I never found out why, but the NSRs have a tendency to smoke more from the lower cylinder at start up and some minutes after.

PS: There is a bushing in the cylinder for the RC valve and this can wear. I had a cylinder where the bushing was missing. I didn't check if the piston could touch the valve though.
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom