I have a honda 250 ex2004 i'm going t get a new slip on exaust will i have to rejet? If not what is needed?

I have a honda 250 ex2004 i'm going t get a new slip on exaust will i have to rejet? If not what is needed?

You may have to rejet, before the switch-out check the spark plug to see how the firing tip is burning fuel and after the switch-out ride the bike for 20 minutes or so and recheck the firing tip again.