My “Roadster” is completely stock, Tecumseh Hs-40, diaphragm carb, governor untouched. Can’t wait to finish my Black Widow replica, then we’ll see how fast it’ll be. BW has an HS50, ARC rod, governor completely removed, Dellorto UA16S carb, 1” straight pipe exhaust. Massacre, what are your HS50’s specs?