When you ran the n1ef it is "pulling over". This is a condition where the idle screw is turned all.the way in and the carb circuits are no longer properly separated.
Whenever one goes away from the n1ef to a more proper needle it is critical to back out the idle screw and reset the idle mixture screw Otherwise, you put in a good needle and pilot jet and you still have too much fuel from needle and air through slide at idle and it will still be pulling over...
And if you don't fix the your idle screw setting.when you swap jetting , then you start hunting for a leaner and leaner pilot jet until your jetting is, again, completely dorked.
If it were me, I would start with my idle screw backed out at least a turn, 42 pilot and set your idle screw at 2 and a quarter to 2 and a half turns to start. Forget the old standard of "1.5 turns out on air screw is good".
Ask jakobi where he has his idle screw set. How many turns out from coil bound.
Jeff
P.S. Others here have had good luck using an oem yamaha or Suzuki needle....
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