Stewart its smooth idle at 3800-4000 so far or flat out very little vibration so I assume balanced I was messing around and shoved in the carb for the MVVS 1,5 in the sharma 09 DRAT the barrel is too short for the grub screws to grab then a brainstorm looks like you could drill a hole 2mm or so 45 degrees to the crankin the carb spigot above the center of the grub screws tap the hole and retain the carb
then back out the grubs enough to clear the bottom of the MVVS carb and use some lock tite on them otherwise big airholes both sides of carb martin

I have an extra MVVS carb for my 1.5 and air bleed on it also action much smoother on it