Since we are discussing it:
SAE: Corrected to 29.23 inHg, 0% humidity, and 77°F
STD: Corrected to 29.92 inHg 0% humidity and 77°F
The difference in numbers will be ~2.6xxxx% (STD being higher)
In the Dynojet world... the engine's A/F ratio is adjusted at the following throttle positions:
2%, 5%, 10%, 20%, 40%, 60%, 80% and 100%
And in 250 rpm increments at each throttle position... on a table that looks like this:
With a sepatate table for each cylinder. Fuel can be increased or decreased in each cell. That covers the tuning part...
The dyno itself is just a meausing device, no different than a yardstick or tape measure. It simply allows a reapeatable and consistant means of measuring the output of the engine, allowing you to see if the changes you made were beneficial or not.
People say 'you can't ride a dyno chart'... but in reality when you open the throttle you are LITERALLY riding the dyno chart.
Or they say 'what's important is how the bike feels on the road'... but that will be directly related to how well it is tuned and how efficiently it converts gasoline and air into forward motion, whether the throttle is at 5% or 100%.