Step 1: Go to the Yamaha Motor USA website.
Step 2: Click the Owners tab at the top of the page.
Step 3: Enter the model name, in this case 'YZ80' in the search bar and click Search.
Step 4: From the list of available manuals, select the Repair Manual for the 1980 YZ80.
Step 5: Click the Add to Cart button.
Step 6: Proceed to checkout and complete the purchase.
Once the purchase is complete, you can download the repair manual from your account.