Hi Louis, yes NEDW will work WAY better than the N1EF. Start in clip 3 and let the main and pilot as they are. It will require tweaking the air screw though.
If you don't use a lot of WOT you can change to a 170 or 172 main jet, but that is fine tuning, we are chasing plug fouling here :-) And don't forget that if it runs leaner at WOT plus the hotter spark plug can be dangerous.
When you feel it is still too rich down low you can go as far as 2,75 turns out on the air screw. GasGas says that is the border line to gor for the next bigger pilot jet. But it would be strange if you need the AS that far out with the smaller 38 pj.
Remember that dropping the needle will also lean it out down low but it will have ab effect on the mid range. If you have time it would be worth to try the 40 pj with the needle in #3.
If nothing helps check the needle jet for wear. If that is still good you can try to use different gas and oil. It sounds weird but I had a fouling problem caused by a specific oil.
Good Luck ;-)
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