Do not add.
The reason for this is that most of the mainstream commercial vehicle class motorcycles nowadays have a separate lubrication system.
In this case, the 2-st oil will be compositionally separated, and it is possible that the 2-st oil will seize without entering the internal combustion engine.
Even in the case of the mixed lubrication method, carbon will adhere when burning in the combustion chamber.
Problems are unlikely to occur if the head is frequently maintained in races, but for general driving purposes, the above problems may occur, so please refrain from using it.