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JD kit with Pro Circuit T4

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I have an '04 CRF 450 with the JD kit - stock apart from the airbox and backfire screen mods. Using the settings specified in the kit, it runs great.

I then fitted a new Pro Circuit T4 muffler and it runs nasty... starts and idles, but burbles and loads up with any throttle. Give it gas in a hurry and she justs dies.

Stock muffler back on, and it is fine again.

Any suggestions from the jetting guru?

:cry:

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The symptoms sound like it's running to rich with the change in exhaust.

Try using a leaner clip position, moving the clip 1 step closer towards the top. Adjust the fuel screw inwards 1/4 turn and then keep the idle speed slightly high.

Let me know your progress.

Thanks,

James

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