Spark Plug reading

[trevarthan]

Hello,

We've got a bit of variation on our plugs after the carb rebuild.

This is plug 1: https://youtu.be/JvkZGn-QC-E

And this is plug 3: https://youtu.be/gQVyJhMcA1c

Plug 1 looks pretty lean to me.

We bent the rochester monojet metering rod arm a bit to make it richer a couple of weeks ago, but I'm not seeing a difference in plug color.

Will a lean plug start showing as less lean if the mixture has been corrected? Or does it get burnt permanently and should we install new plugs and run it for a while?

Thanks!