How do you change drive belt on eton thunder 90?

To change the drive belt on an Eton Thunder 90, first, ensure the engine is off and cool. Remove the plastic cover that protects the drive belt, usually held by screws or clips. Then, loosen the tensioner to relieve tension on the belt, remove the old belt, and install the new one by threading it over the pulleys. Finally, reapply tension to the belt, replace the cover, and ensure everything is secure before testing.