B767-300 Captain reported conducting a go-around on short final approach due to an aircraft on the runway and which resulted in momentary stick shaker activation.

Narrative

Weather 5000 broken; light drizzle; fair visibility; Flaps 30 approach; tailwind 8 kt; Landing weight approximately 278000 Lb. On the short final after passing thousand feet AGL at approximately 700 ft AGL Tower called a go-around due to runway not clear (prior; there was a radio communication in a non-English language between tower ATC and another possible aircraft; but we never saw anything on the runway). Executed the maneuver with automation engaged. Right as PM called 'positive rate' and calling 'gear up' the stick shaker activated for a brief moment; speed was below amber caution and just inside the top of red zone on the speed tape. As the stick shaker went off the autopilot disengaged; I advanced the trust levers manually to the full forward position and adjusted the aircraft attitude to recover the airspeed. The speed recovery was fairly quick; reengaged the automation and the rest of a missed approach and the second approach to landing went normal.This event developed very quickly. It felt taking maximum 4-5 seconds from initiating a go-around maneuver to a stick shaker activation. Thrust did advance but in retrospect I should've been more firm in pushing against trust servos and advancing levers forward; possibly immediately to a full forward position. During our debrief we also realized that we missed callout 'Trust Set'; the fairly recent change in the flight manual go-around maneuver profile.Suggestion: To see the real data on this event and learn more.