May have mentioned this before, when balancing carbs I do idle and cruise power settings and then check mid range, the twin throttle cables are the best the springs are not as strong going too full throttle, but are very necessary, if you look at the arm as it travels from closed too full throttle it goes in a slight arc, if there’s any lack of smoothness they lag thus imbalance. With the electronic carb mate balancer you can see if this is occurring, remember throttle must be closed when using choke for start,
If you open the throttle even a quarter the choke become ineffective. Always check the springs are secure on that choke as well.
there’s no voodoo in balancing the carbs, if you want too change the idle , turn both idle stop screws the same amount, please stop the engine before adjusting anything, one slip or lack of consideration of what that whirling prop will do is not worth the cost.props are live always! treat so,
even with those mags off!
That’s why a dead cut check during shut down confirms the sucker is grounded,
stay safe,