So when I push down the tickler,I'm really holding down the seat in return holding down the float bowl..I realize its confirming that's theres going to gas available but isn't it really flooding and how does that help? Cant I just leave it alone since it should full and at float bowl level?
It's a bit of a crude way of raising the level of petrol in the float bowl in order to enrich the mixture. Modern carbs use a more sophisticated enricher device to achieve the same end but both approaches can end up flooding the engine and making it difficult to start.
Most of us ( I think ) hold the tickler down just until fuel appears. This "Floods" the carb to provide a richer mixture to help with starting.
My A50 will start without doing this, my B40 wont! My Bantam has to be flooded a few times to get the engine to start especially if been left for a week or two.
Another point ( not applicable to a 376 carb ) is that the float level and therefore the fuel level in the float bowl can be altered by adjusting the float lever resting on the fuel lever. I believe with the monobloc carbs, the needle seat has to be moved to adjust the fuel level.