You do not mention the model of Motorola radio that you have, so this answer will be generic. If your radio is a Motorola TalkAbout FRS style radio, parts and schematics are not available, so the unit would not be repairable. (Exception would be TalkAbout Distance or Distance DPS)
As for preventing a blown speaker, the best advice would be: 1) to keep the speaker area clear of dust or debris containing metal fragments, 2) keep the radio dry, and 3) do not run at full volume long periods of time, back it off to 75-80% volume for best results.
If the radio is relatively new, it may be under warranty, contact Motorola at the number in your user guide for possible warranty replacement.
Best regards.
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