32mm or 34mm
buy a VM 200 or 400 ( have to look at the number) off the shelf rubber Mukuni rubber mount. bolts stright on and in, no messing around or drilling required ( can give part number or just buy from IWT and post.
I can give you the jet specs in a PM if you like, im almost built mine and will recheck with a flat jet run this weekend on a 32mm the others are really too big and the air ratio get out of whack for mx you might be able to pull it in a DT but keep under 34mm to get eh response and pull out of it.
remember PPort will need a fat pilot and a lean main, remember MUkumis are cumlative .