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Jetting help on brand new 04 525exc

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I am trying to dial in my jetting on a brand new 04 525exc, stock everything except I am using the JD kit. I am using the kick start, long story, I am at 6000' about 70 degrees and I am using the Red needle #4 and a 170 main, it runs good but has a lot of popping and is very hard to start and dies with no throttle. Plug looked ok, maybe a little dark. Any suggestions? Thanks

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