These are the "Wheel removal" pages from the Shop Manual
Clicking on any image to see a larger, high-resolution image.
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The above is page 12-6.
Note that the above refers to page 11-2 for "frame covers." I did not scan that page because it varies significantly from year-to-year model. Pages below show the removal and reinstallation of the muffler, as required on page 13-2 above.
Note that the 1985 model year (shown here) has much different battery box, oil tank and frame covers than earlier years. Your NH80 may or may not require removal of the front cover to access these nuts..

Pages © Honda Motor Co. Ltd. 1985
Reproduced here for personal use only.
NH80 Owners Club Online