You are very close to me in temps and altitude.
My 2011 EC300 is jetted with:
172 main
N3CH needle #2
38 pilot.
But I stay at and above 1500M, you may feel better at 40 pilot, #3 clip and even perhaps even a 175 main if you are pushing hard at the lower end of the altitude range you listed.
In any case: toss that worthless N1EF needle. If needle availability is an issue, grab which ever stock 250 KTM, Kawi, Suzuki, or Yamaha needle you can find and after a couple of quick experimentation swaps of mains from 172 -178 you'll be close enough to be much happier than you are now...
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Newest Spanish Girlfriend: 2011 300 Six Days
My Daughter is a U.S. Marine
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