Walbro was another maker. Sometimes the carbs appear almost identical but could be made by either Tillotson or Walbro. There should be a cast number on it someplace that starts with W if it’s a Walbro. I am basing these statements on my knowledge of the 8, 9.9 and 15 carbs, which were more common to me. I only saw a few 25s and hated them because they idled horrible.
Long live American manufacturing!
