[(F5)]

You can't tell squat looking at the plug. It's a roadrace thing for full open (mainjet) and only counts for a set test procedure.

Above good suggestions.

Then pull carb. Clean and blow through every hole and check hoses. Then with good light and a magnifier of some sort check you needle jet hole. The orifice should be round, not even slightly oval.

Then read what needle you have . If it's a N1FE or whatever std is that will be a large part of the problem. Moving it on the clip won't help it being too skinny to start with. Cut it in 1/2 so you're not tempted into using it again. Really.

Read the jetting threads here.