CHT increase
I thought it was odd also as I imagined the restricted air will give a richer mixture which would be cooler but the air filter is the only thing I have changed and its back to running at the lower temp it was before. My leaning method is basically screw it out till it runs rough then back it in a tad to pick back up the higher rpm . So I'm not sure why it is was doing what it was doing but happy it's back to normal