Help Problem with a low rpm bogging

Hi guys I have a 2002 ktm 125sx and it’s bogging before powerband. When I go like 1/4 throttle its boggin but when I go full throttle it active the powerband fine. It is a air-fuel mixture adjustment? I think my bike has a lean bog or i don’t know what going on. Maybe do I have to jettin? I clean the carb, the bike is mint condition fresh 29hr engine. But that bogging got me so frustrated. Somebody can help me with some tips or advise please?