Pinging B$@&%@rd 440!
I had that issue and installed smaller air bleeds for the secondaries to richen it up on the big end . It was and easy test without disassembling the carb and worked. . I was running 12.8-1 with race fuel through mufflers. Something you could try if you have replaceable bleeds as the first picture. You can remove the fixed bleeds and install changeable style easy with the carb off. This lets you fine tune easily when at the track.
I had that issue and installed smaller air bleeds for the secondaries to richen it up on the big end . It was and easy test without disassembling the carb and worked. . I was running 12.8-1 with race fuel through mufflers. Something you could try if you have replaceable bleeds as the first picture. You can remove the fixed bleeds and install changeable style easy with the carb off. This lets you fine tune easily when at the track.