Hi
I have a 2004 EC250 and had a heap of trouble with mine when I first got it
I spent money on it trying sort it out then I started to re jet which didn't help much until I had a new CDI put in and the stator rewound
Anyway I am at this set up
NEDW #2
175 main
40 pilot
Air screw 2 turns out
I ride at sea level and dry conditions, the bike pulls hard in ever gear
Probably could even go to a 172 main
Other needles to try are NECW and DDK
Good luck and don't be afraid to have your electrics tested.... I wish I had mine tested first!!!
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