So I've finally put my Ninja 250 back into service after nearly 3 years of downtime. Don't ask.
Anyway, before I put it up, I had added K&N pods, gone with 108 mains and 1 shim under the needle. Stock with the airbox is 105, no shim.
I've been accelerating with wide throttle openings between 3-4K, and today I took out the shims. Power below the point the main jet opens seems a little reduced, the engine falls off much faster when dropping the throttle, letting the clutch out while revving needs to be done a little more carefully to avoid stalling the engine and the engine still cruises fine, no hiccuping.
I don't have any method of measuring my air/fuel ratio, so I'd like to know from those who tune carbs if the above sounds like its running lean enough to cause damage.