Need to post your engine's numbers. I am not familiar with Victa setup.
On the triangle piece that is the carburetor's throttle control plate assembly and it position is normal as the governor will close it as needed upon engine start. This setup does not have a choke; just a primer.
That small piece is either a check valve or a metering jet. I haven't seen one on a pulse prime carburetor but that we need to look the engine's ipl. We can't do that without the engine's numbers.
