Need help with vibration!!

Yea I know the balancing sounded odd, started off that it was going to be balanced exactly like my 340, and I was ok with that, then when motor was done, my motor guy was trying to save me a few pennies I think and did the half and half thing, I'm still learning and just took it as it was ok, but now I'm not so sure, and if it is that would balancing the flywheel correct that now?
If that is the case, to balance a flywheel you need the whole motor to do so or can I just take flywheel somewhere to be balanced?