[Shadowfire]

Idle speed dropping. Dropped down to ~1100rpm. Battery voltage dropping below 12V during usage.

Sprayed the carb exterior with starter fluid, bike roared to life from an almost-stall.
Removed all the plastics; the intake manifold is split.
Ordered a new intake manifold, and trying to find a place that sells the Helix carburetor support brackets. The YY250T doesn't have the support bracket. Does anyone know of a source that has these in stock? (As a kit, with all the associated mounting hardware.)

Clamped a good DVM on the battery:
12.024V when bike is off.
Start the bike, after it finally kicks over, is at 11.920V.
Voltage slowly climbs as I rev the engine to 3000RPM. I turn off the bike after the battery gets to 12.100V. The charging system is obviously working, but the stock battery is on its last legs.
Replaced with an AGM battery from Autozone.