The accelerator pumps should be adjusted to where there is NO freeplay, but that pump lever is not actually moved..if that makes sense. You want to adjust it to where the screw just BARELY touches the pump lever arm.
Flat spots, if they are due to accelerator pump issues, can sometimes be corrected by changing the pump cam...the little nylon cam that screws on the linkage that the pump adjustment lever rides on.
At cruising speeds, the acc. pump really shouldn't be doing much anyway, but they do add a short skwert of fuel quickly, to overcome the flat spot....
hth
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Joel Adams
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