Power valve not opening

Yeah, mine too... of course it could have been a little wet just from taking the (emptied) bowl and block off too, gas does tend to run around. Will take a closer look and maybe sub another PV as recommended.

This carb is brand new from about a year ago and I've put maybe 500 street miles on it since then. Everything looks great, the PV just isn't working. I also suspect a clump of crud somewhere that may be fun to locate. Was hoping to avoid pulling the carb.

Re: 10.5" PV, I did try one last year but that comes in much sooner than needed for low-speed or even highway cruising. I have a [email protected] cam that idles at 8" and makes 12-15" depending on cruise rpm. Just wiggling my toe will drop it below 10"... As has been pointed out here by @Mattax and on racingfuelsystems, the mixture actually needs to get leaner until approximately 50-70% of max power, then start richening up. Even an 8.5" was a little too sensitive.