XS750’s went unreliable after 20k, primary chain stretch, crank failures, electrical demise and exploding gearboxes. Post ’79 750’s superior; the XS850 more reliable, although its ign pick-up failed at unlikely moments. Handling and brakes were okay at touring speeds but wear or high velocities turned them pathetic. Look for smooth power delivery, gearbox and shaft; upgraded suspension and intact exhaust. A minority managed high miles.
