Sorry I only came across this upload a year later, and your question, which remains unanswered. The answer is that if you go to 0:50 seconds, above the letter for the logo "K", just to the left of that "K" is a projected casting line. At that point it is VIRTICLE 90deg. That is your float line - which is measured from the bottom of the float to the mating surface of the carb body. I don't know if it helps you at all now but others may read this. Hope it helps them.
