Also, if I'm looking to open up the high speed jets (sorry if I've got the nomenclature wrong on these bikes...just that other bikes I've had did have a "high and low" speed jet), how exactly do you do that.
Johnny,
The ST1100 uses a CV (constant velocity) carb. that has a pilot (slow) jet, a slide/needle jet/jet needle (two parts to the same system), and a main jet.
The pilot is used for idle to 1/4 throttle (approximately), the slide/needle combination fo the mid-range and the main jet for full throttle.
With the power of the ST I'd bet your almost never using the main jet.
The "problem" with jetting is that all the different parts of the system overlap so the pilot jet size affects mid-range and the main jet size has some effect at lower throttle openings.
That being said, most bikes of this era were set up from the factory to be a bit lean at idle and just "off-idle" since that's how they were tested for emissions.
Opening up the mains should only be considered if you've done considerable modifications to the intake or exhaust system of the engine.
My ST seems to carburate perfectly with no evidence of lean-ness even down low when pulling one or even 2 gears higher than I should.