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Hi all,

This is my first 400ex although Ive been around quads and dirt bikes most of my life. Did all the typical stuff changed fluids, adjusted valves etc etc. Next threw a new plug in it and ripped it around to see how its running. Doesn't pop on acceleration or deceleration and starts on the first push of the button. Looks to me like its running lean should I bump up the main and the pilot or just the main because it idles fine? And would bumping 1 size be sufficient or jump up 2? Thanks in advance (photo below)

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