This is what I've been running for the last two years in my 06 EC 300.
Needle: N3CG in the middle position.
Pilot: 42
Main: 178
Airscrew: 2.5 turns out.
That needle is from Yamaha. You can order them from a Yamaha dealer or online. They were optional in YZ-250's.
Yamaha part number for the needle: 4SR-14916-CG-00
I would buy a 40 and 42 pilot, the needle, and a 175, 178, and 180 main and experiment. In the hot summer a 40 and a 175 work but most the time I don't bother changing.
My elevation is 1000- 4000 ft.
Jetting questions are usually answered at "Enduro Intake/Carburetion - 2 stroke" section of the forum. Try there for more info.
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