To find the accurate engine oil capacity for your 1981 CB750, I recommend:
* Checking your owner's manual: This is the most reliable source for specific details about your motorcycle.
* Consulting a reputable online resource: Websites like Motorcycle.com or Honda's official website might have service manuals or technical information for your model year.
* Contacting a Honda dealership or certified mechanic: They can provide accurate information based on your specific motorcycle's VIN.
Please note that engine oil capacity can vary slightly depending on the condition of the engine and other factors.