It wont do it if i rev it at idle. Only when im moving. Its an 87 with .20 hot rods crank. Cool head. Boost blottle. Power wings. 35mm pwks. I may have fixed the issue. I put new needles in last week and it still pisses so il have to adjusy floats. When i reassembled carbs and everything i noticed that the left carbs bowl rubs on tge clutch hinge on the case. I got it so it just barely touches and doesnt move the carb when you pull the lever. Il see if that fixes the issue.