:IH Trusted Hand:
2 skools of thought:
Pull the head and view the witness marks of the screw indentations in the piston & head, possibly the screw is still stuck in one of them, I've seen it.
Other thought:
leave well enough alone, what is done is done.
Your engine your choice.
Me, I'm curious George:biggrin2:

You need to STAKE those screws so they CAN"T come out.

Have you had this carb apart before?

Maybe someone else (PO comes to mind) had and tried to unscrew the screws WITHOUT filing the staked ends off and broke one and maybe compromised the strength of the other enough to cause it to break once they got it running again and after they were done screwing with it.

Can you please explain the process of STAKING the screws. Thank you

Ken

Look at the back of the throttle plate (if you can) and you will see that the exposed end of the screw appear to have been spread by some sort of tool and will look like a chisel mark smack dab on the end of the screw.

Probably a special compression tool of some sort used during assembly.

That's why one needs to file off the exposed threads before attempting to extract the screw in a normal manner when removing the throttle shaft for bushing installation to repair a worn carb body.

I wont be pulling the head. Brass is pretty soft and the engine was running well. But my problem now is finding the right brass screws. I need a source, my Ace Hardware had them down to #4 but that was TOO big in diameter and was of a more course thread pitch. I tried to get it to thread but just broke off the head.

Any suggestions on where to buy those 2 screws?

Thanks!

I don't think I would pay this price and it's probably not what you need, but a google search for "throttle plate screws" got me to this. I'm sure you can search for yourself and do betterer....

https://www.ereplacementparts.com/sc...iABEgL6o_D_BwE