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Do you have enough confidence in the oil at 100:1 ?

You hate them because you don't understand them and you don't want to take the time to learn how they work. That attitude is going to be a major hinderance to your ability to repair small engines.

A surging engine is usually always attributed to a lean condition. A lean condition occurs when there's a blockage in the carburetor. Carburetors get contaminated very easy. You must keep the fuel absolutely sterile.

I have that same Stihl screwdriver and it fits my FS 91 R perfect. It fits the H and L screws. For the 3rd screw which is the idle speed screw, I use a Snap-on SDM211B. https://shop.snapon.com/product/Flat-Tip-(Bits,-Hex-Shank)/.031-x-.187"-Flat-Tip-1-4"-Hex-Shank-Bit/SDM211B

80:1 seems to be a popular ratio for Amsoil Saber. That would be 4 ounces per every 2.5 gallons. https://www.lawnsite.com/threads/response-from-amsoil.522137/

Hopefully the 2024 pilot jet is not out there in circulation except on the factory assembly line. Perhaps Yamaha knows the 2019 pilot jet is the cure, but per EPA/CARB restrictions, can't tell the public.

Do you have a link to the 2019 catalog?

That's unbelievable. You can't get any luckier than that. Unreal.

Are you saying you didn't know the jet would be larger until you received it?

You sure lucked out on that. A lot of people don't have that luxury.

I found a short video of the Stahlwille jet reamer set. I'll probably have to go that route because my jet is not removable. https://www.kctool.com/stahlwille-11085-jet-reamer-set/

So is the 2019 pilot jet different than your original jet?

Be careful of those torch tip cleaners; they're serrated and they will enlarge holes in soft metal like brass and aluminum. The idea is to remove the obstruction without enlarging the hole.

https://chadstoolbox.com/74310001-stahlwille-11085-jet-reamers-with-case/ https://www.partzilla.com/product/honda/07JPZ-001010B

The screw that The_Eric is referring to is #7 on the drawing. Take it out with a straight slot screwdriver that fills the slot completely. You wouldn't be drilling it out. You would be reaming the hole with special jet reamers. Drill bits don't get the hole concentric. The 1st step now is to...

If you have the engine numbers, I can send you the parts list too.

What's in the way of the carburetor sliding off the studs?

No adjustment screw for the idle jet is typical these days of emissions carbs. The EPA thinks that since not everyone is knowledgeable with how to adjust fuel / air mixture correctly, it'll ban the entire population from making adjustments whether the people know how or not. The idle jet is...

What makes you think the jet is removable? It probably isn't.