jw51 That dual spring set-up is a duration system on your pump I think. Made so when you put the hammer down that solid slug of fuel will be metered out to your carb throat while accelerating.
Between your explanation and Jon’s of that YF design feature got me thinking.....
I’ve always thought the B had kind of a “rubber band” feel to acceleration and deceleration. Like the pendulum swings too fast one way or the other.
For those with experience with both carbs, does the YF transition more smoothly in that regard?
