Trying to tune an inline 400cc 4cyl using 32.5mm Kehin CVK carbs. Tune is ok but I am constantly getting a lean spot between 12500-13500 rpm at wot. Using an AFR of 11.5:1 from 7000 to 12500 then leans drmatically to 13:1 and comes back to 12.5:1 by redline at 14500rpm. The carb is well onto the main jet by this stage, chaning mains only moves the entire curve up and down accordingly. Can a change in emulsion tube or float jet change this???? Regards MB
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