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Z440 w/ JD kit Need Help !

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Help! I just put a JD jetting kit in my FCR... I used the red needle in the 5th groove 178mj and a 42pj 2.5/3/3.5/then 4 turns out per instructions. I previously had a 178mj 48pj 2.5 turns out. My problem was a stumble off idle. Now it will only run with the choke on. Should I try 45pj or 48pj ? Thanks for the help

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Yes, try the #45 pilot jet. This is a relatively rich setting for a CRF450 40mm FCR carburetor.

Is that the correct model this is from?

The next step would be the blue marked needle in the middle clip position.

James

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