The manual for mine (NC750x 2016) specs better than 86, so regular is fine.
Edit for clarity: the manual specifies PON rating -
from the wikipedia
"Anti-Knock Index (AKI) or (R+M)/2
In most countries, including Australia, New Zealand and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States, Brazil, and some other countries, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI), and often written on pumps as (R+M)/2. It may also sometimes be called the Posted Octane Number (PON)."
Nc750x octane level 89, 91, 94 - north america