They adjust up to a point, and mostly do so at idle and in the cruise range up to around 85 KPA. Above that the bike runs in open-loop without feedback from the O2 sensors, but adjusts for altitude and ambient temperature using various on-board sensors. The problem is that by adding a free-flowing AC the open-loop area can run leaner than is optimal, and that's why a tuner is recommended for any Stage 1 upgrade.

It certainly won't damage your engine, as you say, but I must disagree that it's too lean. Stoich is 14.68:1 AFR for pure gas and is considered the ideal mixture for efficient operation. I've run 14.5-14.6 on this bike since new and both head and oil temperatures run at very sane and normal levels. I've also done tests comparing richer AFRs in the cruise range and have found little difference in engine temperatures, although radiated heat from pipes may be noticeably higher because of higher EGT's (exhaust gas temps). What's for sure is that gas mileage decreases much more notably with leaning AFRs than does internal engine heat.

 

I said what I said about the fuel management because if you did mufflers and just an air cleaner, you'd be running sooooo lean you will hurt your bike.

 

Oh, I had the Stage 1 done at the Stealership before I brought the bike home and started making changes. Ordered the PV because I know it will run much better after we get it dialed in.