Hey guys new here, wanted to bounce this around. Just picked up this 79 Cb750F. Only idled with full choke and was backfiring through exhaust. I replaced plugs, drained fuel tank replaced with fresh fuel and seafoam, replaced fuel lines and inline filter. This took care of backfiring completely but still wont idle without full choke. Plug 1 = white with black sooty deposit. Plug 2 = Lean. Plug 3 = Lean. Plug 4 = Rich. Waiting on manual to show up. Plan on soaking carbs, adjusting and then if I need to take em and have them synced. Any thoughts greatly appreciated.