Motorcycle Repair: 82 yahama maxim, mixture problem, speed set

Question
How do you adjust the idle on this bike

Answer
Don't know the specifics on this bike but idle is mostly controlled by two things: throttle and mixture.

If the mixture is good (plugs aren't fouling and the idle is steady as the bike warms up) then you can adjust the speed of the idle by turning the idle speed set knob which you should find somewhere on the carbs.

If OTOH you have a mixture problem then you need to locate the idle mixture screws so you can adjust the mixture and then use the speed knob to adjust the speed back to the correct range.