VTR1000F Stalling at high speed, no throttle response—fuel starvation?

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Half the year has flown by again… I wonder if we’ve made even 1% more progress than last year. That’s what I find myself thinking about, wistfully.
Let’s check out this issue where the engine stalls and cuts out like fuel starvation when you open the throttle.
The vacuum petcock has an ON/OFF switch, presumably for peace of mind. I wonder if there’s a knob…
It’s a real pain to turn.
The images are in mixed order. With the petcock installed and the hose connected, we suck on it with our mouth to confirm gasoline flows.
↓This is the abnormal symptom.
When we suck on the GOOD side, no gasoline comes out and there’s zero suction sensation.
When we suck on the BAD side, gasoline comes out and we feel suction.

Normally gasoline should flow on the GOOD side.
I wondered if it was installed wrong. Gasoline flows, but structurally it’s definitely not right, or so I thought. Then I started the engine and…
it ran terribly. When I disconnected the vacuum hose, it ran fine, but… just for a moment? ??? ( ,,`・ω・´)ンンン?

I figured I should do a synchronization adjustment and also adjust the PS.
Something was definitely wrong inside the petcock, so I opened it up and found the diaphragm was shredded.
I’m amazed it ran at all… what a surprise.

I’m glad this part came up. The petcock assembly was smelling off. ( 16970-MBB-D41 Petcock assy ¥11,100 )
Someone asked me to replace the meter bulbs, so I checked and… none of them light up?
Can something that miraculous happen? I thought it might be a fuse, and sure enough, it was blown. I replaced it, but they still didn’t light—so I replaced all the bulbs and they finally lit up.

This one seems like it could have a lot more issues too. That wraps up today’s work.
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