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I made a topic earlier about this, then thought I figured it out and now im questioning again. The bike is 01 VFR and im trying to sync starter valves. Ran into a problem when I realized that the front right airbox hose isnt connected to anything on the other end, its just plugged with a screw. I have no clue where the lower end of it was connected to, flapper? Still doesnt make sense to me how the vacuum lines go. Below the airbox theres a hose with number 4 on it, is my only choice to take the reading from there? The hose is in a tight spot so im not sure if I can get there. In picture 1 is what I tried lol. In picture 2 is a #4 hose under the airbox connected to something and I figured maybe its a part of the same vacuum line as the higher #4 hose seen on picture 1. I thought perhaps ill get the vacuum reading like this but I cant feel any pulsing on my manometer hose, the other ones do pulse. Also adjusting starter valve #4 showed nothing. The clear hose part is the end which was plugged with a screw. Where do I get the vacuum from? And where was this originally attached to? The earlier owner seems to have done the flapper mod but I want to return it the way it was before.