Jetting for 2001 KTM 125exc

I have the JD jet kit for this bike. The bike was used when we got it, ran OK but would foul the plug everytime we rode it. The JD jet kit says to re-jet based on the current jet in the bike. We had a 175 main in with a needle I can't read..

I tried the 185 JD jet with the Green needle on the 4th clip, bike runs but doesn't seem to have the snap it did before and it is hard to start. I'm uncertain of which way to go with the jets (not sure if I'm rich or lean) Any help would be appreciated. Bike is stock with larger spark arrester muffler.

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