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Upgrade from keihin flat cr?

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Get hold of a complete carb from an '05 or later YZ450.  It's an FCR-MX.  More modern internal circuitry, more reliable, less fussy.  you need to get the hot start assembly with it or the pieces will nickel/dime you up a wall.  Use 450 throttle cable in your throttle grip. "Bolts on".

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