Check the dry side crank seal. Run the bike and spray wd40 or similar behind the stator.
Worn carbs get richer, not leaner!
If it's running fine at low revs but struggles mid way, check for blocked main jet, condition of reeds (unlikely), and air leaks (centre case gasket, left side crank seal etc)
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear
2016 RM-Z450
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