In his "operational" configuration .. this engine was equiped with a starter (see the "starter generator" in the drawing... and the pic)
The FW 190 was a very advanced fighter plane for the era and was fully equiped of sophisticated electrical systems (his cockpit panel and equipement prefigure already the jet age panels)
Could this be the reason why so many were caugh on the ground.
Only when Americans use it (maybe they had not find the right button .. the panel is sophisticated !!)