nhamm,there is an easy way to find a starting point to check where you are at with the plates being equal
find a piece of wire or unwind a paper clip,pick one carburetor as your ‘test’carb.
have someone open, then close the throttle slowly while you hold the wire between the throttle plate at its middle and the side of the carb until there is just the slightest and I mean slightest drag on the piece of wire,stop there.
check the remaining carbs looking to see how close each plate is as far as their relation to your ‘test’ carb.
they should be very close to each other,a very slight variance wont hurt,but if you run into one that is much much tighter or looser than your ‘test’ carb you may have found your culprit if you are having idle issues,this is where you will need an manometer to dial it in the rest of the way.
dont close the throttle plate too tightly on the wire as you will risk nicking the plate or scratching the throttle bore.
be careful !
this is just a starting point to check it,DO NOT try to make any adjustments using this method,its only to give you an idea of where the carbs may be in relation to each other so that you know which one may be causing an issue.
you will find that depending on a cylinders health,one cylinder may need more or less throttle plate opening to run equal to the others,not that unusual to see this.
this is why you need the manometer to dial it in.
