3B rebuild

[Claus Vegener]

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Hi
I am rebuilding my old 3B using
2. size piston (same weight as original) and original crankshaft.
I want to use the better (least worn or rusty) parts from the two engines:
Question:
Can I take the flywheel and harmonic balancer (the pulleys)
from another 3B.
Or are these parts balanced at the final assembly from factory?
TIA
Claus Vegener
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