Quote:

...you can get those in between sizes from your local indie HD shop...



I took your advice & the local independent Hog shop does carry pilot jets (a/k/a "slow jet" in V-twin speak) in the "off" sizes.

The 44's at the HD shop were back ordered, & the 45's that I previously ordered from BellaCorse, hadn't arrived yet, so I bought a couple "Keyster" 45 pilots.

I tested the 45 pilots with the NBZT's today, and this is the best overall combination so far, however it isn't yet optimal.

With a warm motor the idle is in the high 13's with the pilot screws 2.5 out, however highway cruise is in the mid 13's, & not up to the 14+ AFR where I want it to be. This tells me that the pilot jets can be slightly smaller, thereby enabling a leaner cruise. Idle AFR can then be adjusted richer with more turns out on the pilot screws.

The NBZT's definitely need less pilot jet than the N3RF's do. I'm keeping the NBZT's though. So this points to the need to try 44 pilot jets (preferrably Keyster brand jets, to control for that variable), which I will do as soon as I can get them.

Currently at WOT high RPM (above 7k) the AFR climbs to near 14, so I may also try slightly larger mains. But first I want to see what those 44 pilots achieve for hiway cruise AFR.

Keep in mind that the throttle plates have 1.58mm air bleed holes, so my results are not comparable to carbs without such air bleeds.

So is all of this worth it? It sure is to me.