Ye, I definitely have a sticky needle issue. I had to tap the housing with a rubber hammer to stop it leaking on one occasion yesterday. I am giving her 4/5 notches of throttle to start. Where I left it yesterday, she will run continually, but only with the choke out. I was playing with the idle and fuel mix, best results were achieved that were way off the recommended turns. I took off the sediment bulb to check for dirt. The gasket fell apart and now I have to wait for a new one before I can try anything else.I watched your video and one thing jumped out at me. On my 9N and all others I have seen you have to hold the choke out. It springs back if the know is let go. Not your starting problem unless something is not connected correctly?
So please clarify. Will it stay running with the choke on? Can you try starting it with a little more throttle to start? Usually if an engine runs only with choke it is an intake leak or carb is dirty/ mal adjusted.
One other thought. Pull the drain plug out of the bottom of the carb to make sure the bowl is filling. You mentioned that the float needle was sticking.
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I will have to search for a vacuum leak