Does a 1986 Honda Motorcycle use Unleaded gas or regular gas?

Please tell me.

It will use unleaded regular gas.

Define regular? If by regular, you mean leaded gas, that they stopped selling in the 70's, then yes, your bike takes unleaded. Since then unleaded gas has become the regular, then you have mid grade and premium, which both are just higher octane.

Care to mention which model of '86 Honda motorcycle you're referring to?

Leaded gas was being phased out during the mid 80's and very few new vehicles were being sold that ran on leaded fuel at that time.

All Honda's since the mid '70's, & other Jap bikes, run on unleaded.

1986 vehicles sold in the US required unleaded gasoline. Leaded gas was no longer available in 1986 for street legal vehicles.

Doesn't really matter, leaded gas is unavailable.

Honda in American market has been made to use unleaded gas since mid/late 1980s on street models. As for the 'regular' meaning mid 80s octane instead of low 90s octane 'premium'? That depends on the actual model- most 'street' models were good with 87 octane but the 'sport' models sometimes specified 89 to 91 octane - meaning current Premium unleaded. Lots of current 'regular' is a 85 octane, midgrade is the 'old' regular 87/89 octane and the older midgrade 89/91 octane is the current premium- the 'old' 94/96 octane premium isn't regularly available- locally 93 octane is tops on unleaded straight premium with some Ethanol 94/96 premium in a few stations.