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backfire screen 04 CR450

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Mine is out, I have the JD kit and live in So Cal. All else is stock. What is the jeting set-up for this mod.

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With the backfire screen removed, the full throttle jetting can be richened by 1-2 steps with the jetting kit needles to a #178-180 main jet in the CRF450R.

(If this seems excessive, consider the 450/525SX has a #185MJ stock with a more open mesh screen and filter.)

James

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