stsndard 250 lc help

[Deleted]

hi every one i have a completley standard 1981 250 lc my problem is it runs like it got k&n,s and pipes on,,, its got that flat spot from 4000 to 6000 rpm,,,,, i think its runnig to rich,, ive adjusted needle hight,, float height its got 190 standard main jets,,,, any clues why it wont rev clean through

thanks
justin

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