Like Joe said, a competent machine shop would have balanced it, or if they
did not have the equipment for it, would have told you who does.
This causes me great concern for you. If the machine shop is clueless about
the balancing, I would be very concerned about how they lightened the
flywheel. For there are certainly ways to do it that make it much more
likely to blow up like a grenade. And that is something you do not want a
flywheel to do.
I sincerely hope they did a good job, and look at you when you ask about
balancing like it's weird you'd even doubt they would not balance it. If
not, there are a number of us who have lightened flywheels, and some
experience with them. It wouldn't be a bad idea to take a picture of the
unit and show it to us for comparison. You could also take the lightened
flywheel to a racing machine shop (lots of circle track types around) and
let them look at it, and balance it.
As for balancing. The racing best is to balance the components
individually, and then the entire rotating mass. For a street car or mild
racer, individual component balancing alone is adequate.
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