I think it is a fixed jet behind the screw. However take the screw out and check to see if it has a tapered needle. If so, initial setting is to LIGHTLY screw down and seat the needle, and then open up to 1 1/2 turns. After engine warms up adjust to smooth running at 3200 rpm, and make sure accelerates without stumbling from idle when you goose the throttle.

It was originally(at least as i found it) it was turned in all the way. Upon trying it, it is very loose so i took it out to put some pipe tape on it to make it tighter. it does have a tapered tip.

So far i can get it to start but it dies. I already replaced the diaphragm.

I'll try the 1.5.

Thx.

Yes, fixed w/ a small orfice in the end. Likely need to clean the main in the stem. If the tank or well is rusty, odds are it won't play well in the future.