I'll second the idle setting. All the PMS
adjustments are supposed to be made at or close to 900 rpms
With a 25% increase in the idle speed(over the current 700rpms), you would have more vacuum, and be moving more fuel thru the primary/pilot
circuit.That would richen up your idle.
Is the KN filter inside the stock airbox? If so, you can add more air by making some alterations(poor mans BAK
), or go to a different air cleaner assembly. I pulled the rubber boot out of the air inlet on mine, and added a 1 3/8 inch hole(size of the carb
My VH Longshots have baffles, but their hard to see. If you put your finger in the end, you'll feel the step if their there.
The factory setting for the PMS, is about2 1/2 turns out from lightly seated. If the PMS has never been tampered with, it'll still have a brass plug over it. To make any adjustments, you have to remove the plug.
If the plug is still covering the PMS, then its likely that the stock needle is still in the carb as well.
By the way, you can check for the PMS plug with a small pocket, makeup, or mechanics mirror without removing the carb. Its on the backside of the carb bowl when your looking at the carb from the right side of the bike.
Use this diagram, and then check on your carb to see if it's still there.
Lower left drawing. Look for the "Pilot Mixture Screw Cover"
...and yet another edit
The idle adjuster, is below the stock airbox. Its a black knob mounted to a bracket right at the base of the cylinders. The throttle stops against it, so if I want to increase the idle, I open the throttle a tad at the handle bars, and turn the knob to the right. When I got my bike, nobody had messed with it for awhile, and it needed some back and forth to loosen it up so it would turn.