40mm HPMX 60 idles; 180 air, 140 mains, 32 vents, floats @10mm
Looks rich to me.
I would have started with a 50 idle, 130 main, and a 200 air.
i know Bruce is probally right about the jetting, but i run 135 main and 175 air and 55 idle with 32 vents in 40 IDF's on a 1776 without issues.
have you taken off the carbs? maybe an airleak or so?