Depending on the carb model the jetting specs will vary. N3EJ works very well for those with the AS2 - Short bowl and flat metal cap. The AS1 - Deep bowl and round threaded cap, will require a richer needle unless at altitude.. reports show probably a G Diameter (N3EG), which is still an optional needle through KTM and Yamaha. Also, changing the needle diameter will change your idle mixture so expect your almost perfect pilot to not be so perfect if you make a significant change to the needle.
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