possible -but probable?
the carb is designed for a basic swept displacement crankcase --as such -if it is reasonably well matched --the RELATIVE fuel air ratio should work throughout entire power band
In this case - I would have slightly closed choke plate to see if the mix goes rich- it should .
I don't know if there is a particular restrictive setup in the high speed discharge port - simply becuse I have never seen a problem with flow.
If someone knows a big deeply held secret aboout how this particular model carb runs lean at high speed -or was calibrated to run lean (restricted flow thru main)- speak up . I would like to know .
I guess the ones I have were sneakily modified by ZDZ?
I don't think so --