Is there an upgrade from the keihin flat cr for a 2000 wr400f?
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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