Vintage bikes have a certain charm, though complex, they existed at a simple time with simple parts and less options. One thing that is very important about an old engine is the gas you put in it. The Honda I own was made at a time when fuel was leaded and Ethanol was not a thing. Now, especially in my area I am hard pressed to find a gas station that offers Ethanol free gas and not all about handling lead additives to my gas.
For 99% of the gas I’ve ran through my bike it was Ethanol free. High Octane gases are good in a pinch, however for old Hondas bad gas will cause a lot of issues. There is an instantaneous different when I run even 93 (10% Ethanol) through my tank. There is a grumble to start it, not the healthy grumble it normally expels, I find it idling uneasily and stalling easier unless you give it a lot of gas. The long term issues involve all of the rubber parts, o-rings and such, eroding. If I have a bad tank I find myself riding aimlessly just to work it out of the lines. The alcohol will absorb water from anywhere it can and that water going into the gas mixture can separate and settle to the bottom of your tank.
Water in your mix will cause misfires and unstable combustion, it will have your fuel mixture running too lean. Ethanol gases contain a third-less energy power than those without it, so essentially you are using more gas for the same performance and getting a poorer compression level. Just a tip I’ve found helpful for my bike, this does not relate to all bikes, but ones from this era need special love and treatment.