What Fuel ?

Please advise me as to what Fuel (Petrol) is best used in my ST70. By using todays
Fuel available, do I need to use and additive, or just use it neat ?
The bike was last used in 1986 in the Leaded Fuel era !! and now getting round to firing it up again.

Unleaded is fine, no additive required......

I heard that some people use Super unleaded and a NGK Iridium CR7HIX spark plug, apparently you get better performance and its runs better.

Thanks for that