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It's generic name is "potting compound", designed to mechanically stabilize and also damp proof the circuit board.
It can be removed but it's difficult, if you Google for "Electrical potting compound" and find a manufacturer they may be able to advise on a suitable solvent. You should be aware that a solvent that removes the resin is likely to damage some of the components as well.
@kg300
the circuit board components are potted in compound
to prevent generator vibration from displacing electronic parts
If it is soft you can slowly remove it with a screwdriver little by little
but if it is hard then nothing can be done.
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