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Cold Weather jetting

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Was wondering if anyone could help me out on this. I've decided that I really don't want to store the bike this winter and would rather ride it the most I can. The bike's always ran fine but I thought I should take a look at the plug and see if the jetting needed any adjustment.

First off:

Am I right to assume that the mixture screw is what you want to make your minor adjustments (1/4 turn etc etc) and that the throttle stop screw just gets set anywhere it needs to be to get the right idle speed depending on where the mixture screw is turned?

I turned my mixture out about a 1/2 turn from where it was originally set and rode for a bit then pulled the plug and took these pics. I turned it out because the plug was obviously a little lean. So if this looks OK, then I'd just set my final idle with the throttle stop screw correct?





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Forgot to add this is a '05 CRF150 and it's a cold weather plug.


Went back out and threw in a brand new cold weather plug and it looks like It's running better with this new setting. Question though, why is the plug staying lighter on one side then the other?




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