That is why I resorted to the squeeze-bulb, of course.WZ507 wrote:Attaching a syringe to the end of the sight-glass tube and applying vacuum to the tube should pull a stream of fuel through the sight-glass circuit that should quickly purge it of any air present. Conversely, one could inject a stream of fuel through the sight-glass tube to assure it was free of air.
Sediment is always disturbing, and that is about all a glass bowl would show on the road. Actually running a motorcycle with an apparatus, even a "glass bowl", never seemed reasonable to me. It would require an observer in a sidecar at best.WZ507 wrote:If you find that disturbing think what you might see in real world use (where vibration and all other forces are at work)!
My intent is to investigate upon the workbench.
At this point, the sightglass did indeed appear to act like a circuit!WZ507 wrote:The 2 above observations regarding the sight-glass circuit reacting excessively to main nozzle flow and bowl draining indicate that the tap for this circuit is too close to flow sources (main nozzle and bowl drain), and the sight-glass circuit "feels" the pressure differential associated with the change in flow associated with either draining the bowl or pulling on the main nozzle.
As shown in my photos, the sightglass and drain are both tapped equally below the bowl entirely.
The simulated bowlstem has a gallery that I will probably tap for a jet, located at the same height as jets. It can be shimmed as necessary, as I have other bowls to investigate.
Either drawing upon the distant "nozzle", or opening the adjacent drain quickly pulled air from the sightglass long before the bowl level reached the 'main' gallery.
First I must find time to collect the static data:
The OEM cork should produce a level of 5/8" when shut, or so I have read, and guestimated myself previously.
Let us see what we get, if it reproduces, and if the sightglass scale is meaningfull.
I'll be lucky if I can even take a pic of it today...