How do you turn idler screw that is seized up on 1981 Honda cb900c?

To free a seized idler screw on a 1981 Honda CB900C, first apply penetrating oil to the screw and let it sit for a while to loosen any rust or corrosion. Use a proper-sized screwdriver to apply even pressure while turning the screw gently in both directions. If it still doesn’t budge, consider using heat from a soldering iron or a heat gun to expand the metal slightly, which may help break the bond. If all else fails, carefully use a screw extractor or tap to remove it without damaging the surrounding components.