Keep that gauge for as long as you can, you never know...
Sounds like you've got help on the way. Great!
Let's ponder on this thing for a few minutes... You say it starts, but dies when you crack the throttle. Will it stay idling if you don't give it the gas, or will it still puke?
145 is about as good as it gets, so we can eliminate compression as a problem. That leaves fuel, air, spark.
You sound confident that the fuel system is OK, I'd just double check that fuel is getting to the cylinder by cranking the engine over for a few seconds with the ignition off, then pulling the plug. It should be wet, almost drippy. If that's the case, and you trust your work on the carb and sealing leaks, that leaves air and spark.
Air is an easy one, are you getting the same symptoms with or without the filter? Does applying the choke make any difference? Other than leaks and clogged filters, this is pretty easy to eliminate as a suspect.
That brings us to ignition, which, given that the bike ran until it was parked outside overnight, is a pretty likely culprit. Make sure the wiring and all connections are clean and tight, burnish the points contacts (use a burnishing tool, or carefully clean them with a small, fine "nail file"), Make sure all the connections to the stator plate are sound, and double check the run/stop switch. Of course, check the high voltage lead and the spark plug cap, and the spark plug.
I have a hunch that, even though you're getting spark, something is erratic in the ignition that's causing the spark to be too weak to fire the fuel/air mix.