Master Cylinder Assembly - 16mm bore. - Recommended for late dual disc Front brakes on 1977-84 XS650's or single front disc brake (1972-76 650's). Yamaha OEM type. Complete with matt black brake lever, brake light switch, banjo bolt and washers. Also fits: XS750 Standard and Special 1977-79 dual disc, XS850 Standard and Special 1980-81 dual disc, XS1100 Standard and Special 1978-81 dual disc.