Jetting on 07trx450er 12.5 to 1 compression stock 450 bore

I’m trying to pick an ear on what will get me closer the carb now has a 160 main and 48 pilot it fired up but shoots flames sometimes when cranking even if it’s warmed up plus I have a bog if I crawl into it hard but if I ease into it it’ll rip. PLEASE HELP!