[SibSerge]

Originally Posted by ducatiman

Found clogged "check valve" (actually a main jet). These are pressed out of and into the carb body (rather than threaded)

Removed, disassembled, cleared/cleaned both fuel openings and *tiny* diaphragm. A 10mm socket shown for reference, note the black circle.
It gets captured into the valve...subject to intake/exhaust pulses, disallows or allows fuel passage, so the valve doubles as both a main jet and a plug on command. Simple, but so tiny, tricky to service.

These little carbs can go for up to $160.....so fix, avoiding replace.
Basic carb kit under $10!

My learning curve progressing...while keeping costs down for the 'scaper.

May I ask what rocket is using this kind of science?