That's not an air filter. Its a flame arrestor. Helps keeps backfires from causing your ski to explode if thee are stray gas fumes in your hull.

What were your high and low speed idle screw set when you got it started.

can you make a video on the fuel lines explaining and showing what everyone does just bought one and need some help

Hello, very interesting video. I have 2 Mikuni 38 carbs on my Kawa jet ski. I changed nozzles and gaskets, cleaned everything.... I put transparent hoses to see the fuel. Problem after filling the hoses with a syringe, the engine runs but the gasoline does not arrive (see the little that remains tends to go back to the tank (no suction to the carbs)? I connected the fuel correctly carburetor according to the plan (intake, return, low engine pump)? I tested the pressure for opening nozzle 19 psi THANKS A LOT

That needle is suppose to be that way it is, doesn't need to be connected to the needle arm.

Any clue why the bottom of my carb isn't round like yours?

Is that a 38mm carb or a 44mm carb