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1980 DR400 carb help

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i have just bored out my 1980 DR400 motor to about a 450.the carb i have for the bike is preety stuffed and are wondering if a carb of another bike will fit and have better jetting for the bigger bore.I am also after the valve gap settings for the rockers.these 2 things are all i need to get it going in the 1982 XR250 frame i have put the motor into.

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White Bros used to do a 36 round slide mikuni conversion, though it was written that anything more than their high compression 420 kit blew the motor and tranny

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