Easy to understand tm28 carb fixes and how they work
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Bike won't start
OK, more than likely the starter jets are blocked both the one in the float bowl and the one on the carb body. Squirt them with carb cleaner and poke them out with wire and blow out with compressed air.
Blogging with airbox snorkel removed, your getting to much air through the pilot jet passage, go up on your pilot to even it out with a bit more fuel from tickover to quarter throttle.
Fowling plugs, check your needle clip position, lift the clip to lean it out. Put it to standard clip if it's been moved and take it from there. It's not usually caused by the main. Think about it your normally riding in the mid range.
Only ticking over on the choke, dying without the choke, pilot passage partially blocked so needs the rich choke circuit to run.