Too tired after 200 plus miles of mostly twisties.  So I can't figure out whether worse running on the pilot jet at altitude means it's lean or rich.  The main jet is fine.  I do have only about 1/3 of white space thickness.

Bike stuttered badly on the pilot at 5000 ft.  From off idle to just under 1/4 throttle, improved to a little over 1/4 throttle, fine from there to full throttle.

Any non-exhausted brains remember how this works?

Thanks!

Cool, I can fix that I suppose.  Enough to increase spacer perhaps?  Maybe I'll try that first.  I have very little spacer really.

Think I'm running a 52.5 pilot with holes.  I have one without holes.  I suppose that makes a difference.

If you arent going to be at altitude for long-
runs crappy just on pilot circuit - turn the idle adjust screw in to lean it out
runs crappy on all circuits - remove the cover for the airbox
If you're going to be at altitude a while you might aswell just rejet.

I run a touch on the lean side,but can tell it runs stronger the warmer it is.