I have looked up the jets using the model and date code of my 22 hp and they are 791501 and 791502 which are 113 and 116 respectively. These are the original jets that are in the carb now. In my original post I was looking for jet sizes rather than part numbers . I guess what I neglected to mention in my original post is that I got bored one day while waiting for parts for this engine and ported the heads , intake and port marched the intake to the heads which increased the air flow and now it needs more fuel to compensate . This comes from the days when I was building automotive racing engines, hard to kick old habits I guess. I know the jets are to small and that is why I was asking if anyone knew what size jets were in a 26 hp .
Governed engines are a slightly different beast.
In a race engine you look to get a steep increase in the power curve for maximum acceleration followed by a flat peak torque line so all you have to do is keep increasing the revs and you power on to victory.
But these engines are governed, at 3600rpm, they spin quite slow compared to a race engine doing 3 to 4 times that speed.
So much of what you would do to get more out of a race engine produces little outcome on a governed engine.
The mower factories work out the power requirements of a mower then add 20% to 25% to that figure then go looking for an engine .
Briggs rates engines in 1/2 Hp incriments and they do this by detuning the engine down to what the mower makers want.
The first 2 numbers in your engine model is the capacity in Cu inches which in your case I am guessing is 44 ( 742cc ) which is a 26Hp engine .
Briggs chokes it down to make a 24 Hp , 22 Hp & 20 Hp engine.
Back in the Pre EPA days the simplist thing was to fit different main jets, now days they choke down the engine & fit different governor springs.
AFAIK the jet sizes do not change within a capacity group.