The bike runs awesome.

That said, light throttle low RPM (just off-idle to approx. 3k, & ONLY at light throttle, i.e. barely cracked) in 2nd gear is running a bit rich, down in the 11's, before coming back up. To be clear, I'm not talking about roll-on throttle acceleration, I'm talking constant throttle position, throttle plate off-idle, however barely cracked open.

One possibility is to go to a larger throttle butterfly plate air bleed. All other things equal that will lean out the idle, at least until the throttle plate starts to open. However, doing that mod would likley require slightly more out on the pilot screw, which may make the highway cruise slightly richer.

Another possibility is to experiment with another needle, such as the OEM NBZY perhaps with shims.

Yet another possibility is to lower the fuel height, although the float height measurement (not the fuel level) is already over 18mm (close to 18.5mm now), so I'm not sure I want to do that. It's already running a slightly lower fuel level than spec.

Then there's the possibility of drilling a 45 pilot jet to make the functional equivalent of a 46 - 47. The trick with that is to find a drill bit that will pass through a 48 but not through a 45. And I don't know that I have one that's sized properly to do that.

The bike runs great overall, & from a power/performace perspective I like the 48's better than the 45's.

The easiest is to try the NBZY needles & play with shim heights.

I get the best results with float heights by pulling the carbs, so that's gonna be a bit more work if I choose that path.

If I can find the right size drill bit to make custom-sized pilot jets then I'll still pull the carbs, as I find it easire to change pilots with the carbs out.

The most intensive is drilling the throttle plate air bleed larger. I'm saving that mod for last.

Top gear 3500 - 3600 RPM cruise is good. WOT acceleration is great. Overall, the bike runs awesome.

I think there's more to be had, though. And I'd like to get some of that 45 pilot jet cruise fuel efficiency back.

I'm open to ideas...